Since most of the responses are "yes," this must be Andy Collins' least favorite ENWorld thread ever.
The obvious problem with 1st level is that there are no "negative level" monsters, and you have to get to 3rd level before you're considered worthy of facing a non-minion Orc or Hobgoblin. I really don't like the "5 hits to kill a kobold" feel of 1st level 4e, and I've seen others complain about this also. It was poor design IMO.
Edit: By contrast, 1st level non-minion goblins make great foes for 4th-5th level PCs, they have just the right levels of Threat and Squishiness to be satisfying.