GOGwiiisfun: I have a few questions. Should I buy Dominions 3 now or wait for a better sale on Dominions 4? Do people still play Dom 3 multiplayer? How's the modding scene? What does it mean by "Other DRM"? I've heard that Gamersgate games are encoded as an extra layer of DRM, and that there is a workaround; if this is true what is the workaround?
People still play Dominions 3, as Dominions 4 has not been as extensively modded, and a lot of people have not bought Dominions 4 yet. That being said, expect to see people gradually moving away from Dom 3 in favour of Dom 4. Dom 4 is quite similar to Dom 3, but improves upon some aspects, and feels better balanced. It gives you more options when giving orders to your force, a better interface in general, more units, more spells and more factions. It also makes some changes to the rule system that are not obvious at first, but which becomes quite apparent when you try to use your old Dom 3 strategies. Also, there is a new victory condition which does not involve killing all other players.
So if you want to get Dom 3 depends on if you want to play it "NOW" or are willing to wait a few months. Dom 4 has already been 66% off once.
Also, in regards to the "other" DRM, it's a CD-key. As far as I can tell, it's the only DRM that the game has. It will prevent multiple people from participating in the same MP game of Dominions with the same key, but that's about it.