Arcane trickster is weak in 5e too soooooo that's in line(also it's an issue with the limtied spells at the moment, no Shield in particular hurts Eldritch Knight and Arcane Trickster)
Have to say my AT on the tabletop has never felt weak. Here I dropped rogue and restarted after getting to level 2 and realising that all of my abilities were basically already accessible by every other member of the party without being considered "class features".
+1 I'd a suspicion they'd be a good test as a class (I was also curious about how 5e plays vs the 13th Age I'm familiar with and figured Rogues would get plenty of skills to test out). As someone who doesn't play 5e in RL, they feel lackluster.
I don't think taking away from other classes is the solution though. Hopefully WoTC will allow some leeway in making them more interesting
