Monk and Dragoon would be the biggest two for me.
I tend to love melee DPS in general, but I hate melee DPS that is hugely positional-dependent specifically. It's hard enough getting my own derp-arse in the right spot, but when I actually DO and then the thing moves (tank moved, someone else ripped aggro, or anything else)........ blaaaaaaargh it just sends me off the deep end. x_x