Dungeon Keeper was one of my favorite games of all time. Every developer attempting to recreate it has failed horribly. Don't play with my heart strings, Gratch!
If you're looking for someone to talk you out of it, that sure won't be me. War for the Overworld isn't "like" Dungeon Keeper, it IS
Dungeon Keeper with a few new wrinkles. Right down to the exact same UI and evil hand cursor.
I've never been able to get the GOG versions running on modern systems, so the 3 hours I spent with it last night took me right back to the days of Pentium II, Voodoo 2, and a 17" CRT monitor that took up half my desk.
I have heard rumblings that the campaign is kinda unbalanced, with some massive and sudden difficulty spikes. I'm more into just running skirmish maps though, those are more fun.