Cat fall, hustle, Damp Power, Grip of iron, Psionic Lions charge,strength of my enemy, and precognition offensive and defensive are all low level Psi warrior powers and all fairly common choices...well except maybe catfall and Strength of my enemy.
Other powers can be augmented to last hours per level.
It takes more PSPs? Of course it does. It has to cost something when you can selectively blast a critter with whichever energy you want on demand, and you can get bonus move actions to move and still take full attacks and turn that mages fireball or any other spell or power into 1pt of damage per die save for half.
It a Mage uses his highest level spell slot, he casts it and goes 'well I am out of powerful spells for today'. A Psion uses his highest level power, then he says 'OK four or five more of those and I will start to get low on PSPs'
While we're on the subject, mages who cast spells to do hitpoint damage are really mostly just wasting their actions...energy substitution is really good for sorcerers, but not that great for a wizard or anyone else who prepares spells ahead of time. I certainly wouldn't consider it an automatic choice for an evoker...Sorcerers are weak compared to Wizards because they lack versatility. Psions are also a lot more versatile than sorcerers in general. Wizards have more long term versatility because given time they can prepare for nearly anything. Psions always have their arsenal ready to use.
I can't comment on the wilder class, because I have never seen 1 played, and the picture in the book was so awful that I always just skip the page so I never read it.
Metamagic rods were mentioned as part of an argument to compare balance...items that BREAK the magic system utterly shouldnt be brought up when you are trying to compare things on a scale side by side. Psions spend some gold to buy Dojes and have access to basically any power in the book, beyond their normal powers known....same issue, it can break a game...Same with Bo9S and items that grant maneuvers.....the theme is the same...giving players access to spells of higher level than they should have, or giving them lots more abilities then they were designed to have is a bad idea.
I like psionics a lot, but I also realize how nasty and broken some of it is...like say Ego Whip. At 1000xp per level with the surgery it seems fairly balanced....it won't get out of control until the very late levels where its not so important anyways...when wizards are casting Wish and druids are shapechanging into wyrms and priests are gating in Planetars all bets are off anyways.