* Games were more focused on the gameplay; no cutscenes to interrupt it (though that started to change in the SNES era).
* Games were faster paced. Even turn based RPGs were faster paced back then as they are more recently. To see this clearly, compare Zelda 2 (or 1) to Ocarina of Time, or Super Metroid to Metroid Prime.
* Back in the NES games, the music would not give me headaches, simply because there was no way to imitate the sound of an electric guitar. (I actually prefer the NES Ys III soundtrack to other versions because of this.)
* Graphics tended to be more clear (if we exclude pre-NES consoles like the Atari). Less visual noise to worry about, it's clear where everything is, and you usually didn't have the awkwardness of the isometric view.
* Music, if it would glitch, would glitch in interesting ways. These days with pre-recorded music you don't get such interesting things to happen.
* Console games would load instantly. (Nowadays, you might see this with smaller PC games, but consoles lost this advantage when they moved to optical media.)
* With certain genres (notably RPGs) being in an early state of their evolution, you would see things you don't see in modern games, like the stat boost mechanics of Ultima 3 and SaGa 1, the lack of a max HP stat in Ultima 1 and 2, and Oubliette's XP-less levels (when you kill an enemy or are killed, there's a chance you qualify for a level up). Even the original Dragon Quest does not play like a typical JRPG, despite the fact that the game basically birthed that sub-genre.
Gudadantza: -Basically they didn't use to have that obsession about "balance". It was something reasonabily created when multiplayer grew popular and it ws needed, but later it spread like a virus in single player games everywhere.
In single player games, there still needs to be some semblance of balance. If the game, or a part of it, is unintentionally way too hard, players will get frustrated.
Another thing I remembered: I enjoy *not* having minigames, at least not mandatory ones. (Minigames that are completely separate from the main game, like Bloodstained's Boss Revenge and Classic modes, are not an issue.) Also, I enjoy *not* having things like insta-fail stealth sequences.
By the way, I could note that Squaresoft had a period where they didn't seem to care about balance at all. You start to see it with Final Fantasy 6 (Ultima is overpowered in that game, especially if combined with a few things to make it more gamebreaking), but it comes up a lot in the early PSX era; FF7 has Knights of the Round, which is gamebreaking on its own, Final Fantasy Tactics has Orlandu, who casually offers to join after a mandatory mission and is really powerful (not to mention Math Skill, but at east that's fun and its own challenge to use correctly), SaGa Frontier has attacks like PluralSlash, not to mention the occasional enemy that can wipe out your party, and I'm pretty sure nobody familiar with Final Fantasy 8 would consider that game balanced.