I think they didn't do a great job of capturing what the expectations of play were supposed to be in 4e, especially the H1-E3 series (which I tried to run recently). They were basically written like adventures for 3.x or earlier editions.Yeah, it seems they had some problems nailing the format down. Like you I have heard that some of the later ones are ok. Amazing considering some of the authors.
The ones in the Essentials line were much better (like Reavers of Harkenwald). I also enjoyed the Lair Assault series and many seasons of D&D Encounters, for what they were.