For the love of all things holy, NO!! Its taken thieves/rogues nearly 35 years to become a competent character in combat. Fighters take the fight to the enemy. Mages cast destructive spells, clerics heal and buff (as well as fling their own destructive spells). Thieves? Well, they are play occasional archer (hitting less than 50% of the time) or sneak-attacker (of which they have neither the hp nor AC to survive in melee against monsters made to challenge fighters).
My reward? I get to solo-game with the DM whenever I go on a thief-y mission (scouting, stealing) while everyone else is bored. Weee!
Personally, I like the fact rogues became martial characters (not as strong as a fighter, but no wimp and easily equal to a cleric) who can go into melee with dodges, feints, and agile attacks as well as sneak, steal, do traps, and lie with the best of em.