How about Torchlight 2 with the Torchfun mod? What the mod does is, it gets rid of one of the most annoying things many ARPGs have (in my opinion): it rescales the game so that you can reach max level in just one playthrough instead of three. So in the same time that you normally level one character to level 100, you can get three different characters to 100.

Some other suggestions:
Symphony – A vertical shooter where you can play in levels created by your own music
The Dark Mod – Play through user-made Thief levels, many of very high quality
Last Knight

... and . Which is basically an updated Depths of Peril with Zombies. A bit too pricey though, IMHO. But there is a [url=https://www.gog.com/game/zombasite_demo]demo so you can see for yourself if you like it enough to warrant the asked price of admission.

bought din's and depths...but seemingly soldak gamee are quite identical one with another ;) diablo like with tactical/tower defense
I like them and I'll play, but....let's go on with our research.

A game with short game bursts, or a short campaign (few hrs) of any genre except for roguelikes (permadeath stressful to me) with highly replayable pve/ai games.
single random missions? user generated content? sandbox?
longevity and replayability in few hrs/option of savegame is my priority.
any genre is ok...shmup, beatemup, strategy, towerdefence..as long as it doesn t require long time committment on a build/hoard - a huge ty to someone who suggested a quick exp mod to tl2, i'll try it!
something like it, in a native game/ as intended from devs?
a arpg where a lot of classes, quick campaign and then replay it?
fate is a bit...boring
or not a rpg, just arcade features

sorry if you find foolish or weirdo my wishes (probbly I am)
I find answers here very interesting, a openminded friendly community here, different from elitist hateful mmoers on reddit or even steam.
convincing myself that we could find this hidden game pearl that lasts decades of play ;)

I feel like the Elder Scrolls games should be mentioned here... true, they are not ARPGs and their campaigns are by no means short, but:

- you get a huge game world where you can do whatever you want whenever you want
- your character is never fixed in what he can and cannot do and you can decide to change which skills he uses at any time
- you don't have to do the main quest at all if you don't want to. Just ignore everything after the character creation/start dungeon and go wherever you like.
- yes, you can play a character for hundreds of hours, but often, a quest line or a dungeon is like a small campaign in its own. Just run along through the game world and see what awaits in the next cave or ruin. And if you've got enough of one character at one point, just start a new one and do something completely different with him or her.
- even within the same dungeons, many things are leveled and/or randomized, so with a different character you will always meet different enemies and find different loot, even if you go to the same places again.
- Mods. Oh my god, mods. You can make the game look and play completely different the second time you play it, you can visit completely new lands, fight new enemies, find new items, and there are even completely new games with their own worlds and stories built with the mod kits.

For me, the Elder Scrolls games are like the definition of replayability. The one with the most freedom is definitely Morrowind (not counting Arena and Daggerfall here, they work somewhat differently). You can literally ignore the main quest from the moment you set foot on the game world and if you never speak to a specific NPC it will never start. Also, you can really go everywhere, which includes flying around with a levitation spell or diving the oceans surrounding the large island the game takes place on. There are many different factions to join, more than in Oblivion or Skyrim, and some of them are exclusive, so if you join one of them you can't join the other, which further increases the replay value.

Granted, if you are used to ARPGs, Morrowind may be a bit difficult to get into, also because its combat system is less action-oriented and more dependent on the character's attributes and skills than in the later games (for example, your attacks can miss and spells can fail if your skills are low). But the game world and the freedom it offers can be extremely intriguing.

The Hotline Miami games have no RPG elements, but they are fairly replayable (trying to get a better time on a level, or beat a level with a different weapon/play style), and work very well for playing in short bursts, too -- and I hear GOG's version of Hotline Miami 2: Wrong Number finally got updated to include the level editor that the Steam version has had for a while, so that should really add to the replayablity of that one in particular (and it also has a hard mode that unlocks after you beat the game normally). But a lot of people prefer the first one overall. As far as I'm concerned, you cant go far wrong with either one.
EDIT: You can only take one or two hits before you die in these games, so you WILL die early and often; but there's no penalty for doing so (no permadeath or anything), other than having to start over at the beginning of the current floor (most levels are buildings composed of multiple floors, and the goal is usually to kill or incapacitate everyone on each of the roughly 2-4 floors), and restarting the current floor is instantaneous.

I played oblivion and skyrim for a hundred hours...great games, but totally oriented on quest, roleplay, story....while my focus in on action/easy fights ;)
also exploration, but same, combat/action oriented

nonetheless, 10/10 rating games, but another genre

That's how unprotected sex is called today, huh? :P
Joking aside, you speak true. ;)

Or family planning, take your pick. ;-)