I'm not really bothered.
I usually prefer it when the enemy has intelligence and doesn't just attack in patterns, though sometimes that can be fun.
The exception of course is zombies and weird brainless monsters, who can be awesome to fight, but only when theres a horde and they're slowly all closing in. That's pretty sweet.
The combat in the Kingdom Hearts series could be repetitive at times but I maintain that it was totally sweet, I never really got the impression that the enemies were easily beaten at any time because although often they weren't too hard to actually kill, they always seem to act with some sort of intelligence. The worst sort of enemies are those that get stuck in door frames or against corners and stuff like that, it just totally ruins the atmosphere, although it can be a lol sometimes.
I also enjoy turn based games, because its all about strategy, spotting weaknesses being able to tell when you need to prepare for that killer move that most bosses have, thats when attacking in patterns can be cool.
I think the best is PvP, because so much more interesting stuff can happen when your opponent really is the same as you and isn't running off an AI script.