Troll -- + 5 throwing waepons is UBAR!
Seriously though... undead, orc, human and NE all have pretty nice racials for rogues. But overall racials don't matter that much.
The orc racial is great in PvP (stun resist), but not so much in PvE. Human racials are pretty nice for a rogue not using daggers, with the +5 they get higher to-hit% and crit% on those weapons, plus perception helps if you know there are other rogues around. NE adds some to dodge, which is nice sometimes, but you have to start in Teldrassil.
But racials aren't critical. They're nice little bonuses that help some. Rogues are pretty powerful in most types of play so that racials aren't really a make or break kind of thing.