Yeah. Dude, this is a late alpha playtest. If you want a complete, fully-tuned game, you're looking in the wrong place- that isn't what the playtest is about. The fact that they are giving us levels up to 20 means that they want to start tuning the higher level stuff and make sure it works. Stuff like the rogue vs. dragon fight are exactly why they gave us the full 20 levels (and I'd wager that nothing above 10th is really even half-done)- so we can find the problems.
I don't know what all the comments I've seen about how WotC is playtesting three packets ahead and the current stuff is set in stone are all about- where do folks get that idea? Did WotC say that, or is it another one of those "I heard it in a post by some random guy and now I believe it" type of things? Have you noticed the level of change in response to feedback from packet to packet? While I'm sure they are a touch ahead of the public playtest, I really doubt whether they have more than a few dozen internal playtesters. Even that is likely a high number.
So yeah- I think you aren't just expecting too much, it sounds like you may be missing the point of the playtest entirely.