There's something strangely satisfying about wading through a swath of enemies, hacking down everything in your way, and emerging victorious. Unfortunately, most RPGs don't work like Dynasty Warriors.
In my opinion the warrior class is best suited to action RPGs/MMOs where there are fewer limits on what one can do. Warriors in current, traditional MMOs are sorely limited by dice rolls and random number generators with regards to dodge chances and damage, particularly in large groups.
In action MMOs, if you jump out of the way of an arrow you've dodged it, it's not "locked" to you like it is in, say, World of Warcraft. While mages and rogues have alternative ways to work around their problems, the warrior can only rely on cold steel. I'm not saying that warriors require more general skill than other classes, though. I'm saying that a lot of current MMOs and RPGs simply aren't "built" for interesting warrior gameplay by sheer virtue of their architecture.