I am going to be the voice of discontent.
I actually kind of agree. Just built a test Psion, and I didn't swap out my 1st-3rd level at-will powers until I hit Epic (23rd) level. Most of the higher heroic and paragon at-will just don't seem that much better than the basic at-wills, and the 4-point augments certainly don't seem better than using the 2 point augments on the lower level powers twice per encounter.
Of course, I was just doing it very quickly, and will admit to not going through the powers with a fine-toothed comb but it certainly raised balance alarm bells for me...
Mods, feel free to cut the below if it's too spoilerific...
Here's probably the worst example I picked up on:
Mind Thrust (lvl 1 at-will) vs. Psychic Brand (lvl 17 at-will).
Unaugmented, Psychic Brand has longer range (20 vs 10) and a rider effect (target can't benefit from concealment or total concealment until the end of your next turn). I'll admit that situationally it's very good, but a lot of the time the effect will be the same.
With the 1 PP augments, both do the same, except with Psychic Brand the target grants combat advantage, Mind Thrust the target takes a penalty to Will equal to your Cha mod (both until the end of your next turn). I'd argue there are situations where either could be better, so probably balanced.
The kicker is the high cost augments (4 PP for Psychic Brand, 2 PP for Mind Thrust). Both do the same damage, except with Psychic Brand the target cannot benefit from concealment or total concealment and gains vulnerability to all damage equal to your Cha mod until the end of your next turn. Mind Thrust gives the target a penalty to all defenses equal to your Cha mod.
Bearing in mind you'll be able to use the augmented Mind Thrust twice as often as Psychic Brand, I know which power I'd rather have. I can see there are some circumstances under which Psychic Brand is better than Mind Thrust, but
most of the time I think the latter will be more useful.