Bard (player) skill-cap?

[Blaiseblah]

Hey guys, newer player here and still kind of kicking around who my main should be and was considering picking up bard. I generally stick with classes that force you to play well, classes that allow good players to stand out(not due to some epeen thing, I just get bored playing simpler classes). I've read in a few places that bard is one of the tougher classes to play and I was wondering if somebody could elaborate on why. Is it just because they have to press a button every 4 seconds or so? If so that just seems tedious more than anything. Or is it because it's actually challenging on a tactical, intellectual level on top of pressing those buttons every 4 seconds?

Some other classes I've been considering are Ench and Shaman, thanks for any input.