No. I can also come up with adventure flow and even with my own rules. But what does it have to do with playtest material?
If I look at painting and say 'I would put this into my bedroom, but artist really draws ugly faces' is your reaction 'what, cannot you repaint face on top of his painting?' ?
I'm saying that things presented in playtest adventure, are, in my opinion, huge step back from quality of combat encounters from 4th edition, which is a kind of disappointing giving promising developments in other areas.
Examples of proper answers:
-I don't like grid-based combat
-Too many monster types are too complicated to handle, so it is easier to manage combat and flavor descriptions of combat with single monster type
-Rules are too poor to make interesting monsters
-In podcast XYZ they said they are sorry about that and will update it with a lot more interesting encounters
Answer like "fix it by yourself and if you don't want to it means you lack imagination" is not what I expected. Maybe I should, it is internet after all..
I was I was about to post a point by point answer your post but then I realized that most of your complaints would probably be addressed by future tactical, or narrative combat module.
As it is, use your own imagination, last playtest we didn't had any special terrain or things like that in the advanture and my players still managed to get extremely interesting fight, more interesting than what we had in our regular 4e games.