This has been my experience as well. When 1st level combats take as long as two hours, and one of the goals of the game was faster combats, somone has really messed up somewhere. Monsters have absurdly high hitpoints and defenses, except for minions (an overly gamist concept) which I have yet to encounter.
This is my major complaint also. In our last game (second game of 4e) our 1st level party fought about 5 kobolds. And it took us an hour and a half.
Now forgive me for being old fashioned, but my memory of kobolds is that they are 'weak' and come in hordes.
5 kobolds should not take that long to finish, and more importantly they should not have more hit points than the party's defender!
There were no minions in this combat, and it got me thinking - if you took a 3e or earlier module and moved it across to 4e, virtually all the kobolds (or goblins etc) that you encounter should be minions.
This seems to be a major rethink on how modules are created. No longer do we see a number of weaklings with one or two leaders at the end (the bbegs), now they're ALL tough. Essentially WotC have re-arranged the system here altogether. We used to fight 'monsters' and a few of those monsters would have classes to make them special. Now
EVERY monster has a class and a number of levels. We're not fighting monsters any more, we're fighting characters. And I for one am not enjoying the difference.
Where are the 1st level critters that get blatted in a single hit? I know this is what minions are for, but they just seem too few and far between. The standard has been reversed - we used to get lots of critters and a few toughies. Now we get lots of toughies and a few critters.
Strangely it puts me in mind of Dawn of War (computer game). That game has 3 difficulty settings. The difference between the settings is simply how tough each creature is. The game doesn't really get any harder. It just gets more boring as you have to stand there shooting at a single monster for 3 hours.