After playing nothing but vanilla since I started, I needed a mod that was far removed from native and I stumbled on the low fantasy 'Chronicles of Talera'. The coolest thing are the story related quests, but the faction skills keep you playing. I never get tired of the Blighted Plague's 'corpse combustion'. When you are getting owned by your enemies you just hit a button and every corpse bursts into a massive inferno, killing friend and foe alike. When the smoke clears you'll find the odds are evened.
Still, I'm always looking for options, so I'll return to this thread and see what's popular and why.