IMO, the 4e rogue buts up against 4e's intense combat focus in a pretty awful way.
The reason for the thief archetype to exist is not a combat reason. It's the Bilbo Baggins type, the guy who knows a lot, who can get you into anywhere, who has shady connections -- in earlier editions, it was more of an explorer than a fighter, and the game was balanced kind of around general exploration rather than explicit combat.
In 4e, the rogue NEEDS to be balanced for combat, and, basically, nothing else matters. They've lost their unique powers that made them special, the thing that they brought to the table that no other class did, and they fare worse for the conversion than wizards and clerics because wizards and clerics have "magic" (and 4e rituals) to fall back on, but rogues do not.
This is part of why you get the trickster rogue and the athletic rogue, but not the intelligent rogue.
So the rogue remains in for legacy, and because "dexterity-based fighter" is kind of an archetype. But the ninja smoke-bomb rogues of 4e are not the same archetype as Bilbo Baggins. Really, ANYONE in 4e can be the sneaky guy who opens doors and has underworld contacts (some maybe better than others). It's not a class archetype anymore.
Personally, I'm not a fan of it. I don't mind rogues being combat-balanced, or promoting backstab to an "almost always on" effect to do that, or using Dexterity as a means of defense. All that is well and good. What I'm not a huge fan of is that rogues don't have a good noncombat niche anymore, because no one has a noncombat niche anymore. It annoys me in general and it ESPECIALLY annoys me with the rogue.