Plane Sailing
Astral Admin - Mwahahaha!
Yes and no. I did run my group through the adventure against the 4th level dragon, and that battle alone literally took 4 hours. After blowing their one daily and one encounter spell, the rest of the fight was just flinging at-wills, and it got really boring. And this was a very low level fight. I haven't played a high level game yet, but the math speaks for itself.
Honestly, this is not the best platform to base your assertion that the math is all broken, now is it?
1st level characters have one encounter spell, one daily spell, no magic items... it is a worst case situation for them.
I would hesitate to comment on how well thought out (or otherwise) it might be until I'd played a number of paragon and epic encounters too - The extra damage from crits with magic items, the extra powers of some magic items, the wider range of encounter and daily powers, each of which do more damage... You really need to consider factoring these in order to understand how well the maths stands up in the whole game.
Cheers