So far, I rate the first six adventures as follows:
H1: Keep on the Shadowfell - a very good adventure. The initial stages of the adventure work really well, and you can become very attached to the townsfolk as you travel to and from the adventure areas. There's not enough development in the final section of the dungeon, though, and the final villain hasn't been foreshadowed enough. 7 out of 10.
Wow... that's astonishing, dude. I have read through H1 and find it one of the most pathetic, lazy, kindergarten-level modules I think I've come across! And the fact (at least by your ratings) that most of the others are actually worse than this steamer is quite disturbing.
On a scale of 1 to 10, I would have thought this one would merit a 2 or a 3 tops. But evidently it's close to the high end of 4e modules. What a colossal embarrassment!