Just so we're clear, I know psionics is considered more powerful than, say, a fighter, because of Ego Whip (brokenly good), and some standard wizard tricks they emulate... I just think that they're not good enough to justify playing one when you could be, say, a factotum. The wizard's supposed to be the weak guy in the back ( ), and I think that, for the guy in the back, the psion doesn't have enough tricks outside of standard blasting and a few things like psionic grease. hell, there isn't even psionic Web!
I'd put the Psion well above the Factotum for power, and honestly fairly close to the Wizard in power, and here's why...
- no ASF. If a Psion doesn't need to make attack rolls, she doesn't take any real penalty for nonproficiency with armor/shields. This means you can get a much higher and more reliable base AC than a Wizard, with minimal investment. Or you can use Inertial Armor and be just as good (and scale more smoothly) as a Wizard with Mage Armor.
- Vigor. The ability to have temp hitpoints out the wazoo at the drop of a hat is not to be underrated, and can significantly extend a Psion's lifespan compared to a Wizard, in situations where hp damage is unavoidable (which, honestly, come up in just about every session I've ever played). Wizard has no comparable spell I've ever seen. Try Vigor, shared with a psicrystal, followed by Share Pain. CL*10 extra hitpoints before you start actually taking damage is pretty sweet.
- Energy Missile. A better blast power than just about any spell I can think of. Available at low level, does solid damage that can bypass most defenses based on how you type it, easy to target enemies without catching friends in crossfire. Categorically superior to Fireball in almost all contexts, and makes Psion blasting quite viable at almost any level. Yes, blasting's weak for arcanists, but the Psion can take this one power and having blasting covered sufficiently for just about her entire career, and be a solid contribution to most teams.
- Astral Construct. Pretty solidly superior to most uses of Summon Monster, and again only requires a single power as opposed to an entire chain of spells.
- Charm/Dominate. Psionic versions are cheaper, better, and more flexible. Seeing as how these are some of the best "save-or-lose" spells out there (since you simultaneously lose a foe and gain an ally), that's saying something. And again, you're bundling multiple spells into a single power that you only have to take once.
- Ego Whip / Crystallize / etc. Wizards have their famous save-or-lose powers, Psions have their own. Don't expect a Psion to have the same tricks a Wizard has, and don't expect a Wizard to have the same tricks a Psion has. Psions don't get "Web", but they get plenty of other useful powers. And, because so many of their powers cover multiple spells, they're free to choose a wide variety to cover all their bases, without needing to spend half their WBL on scribing.
- Freedom of Movement / Concealing Amorpha / Overland Flight / Contingency / etc. Psions get their own forms of most of the classic popular Wizard spells, and generally get them at the same level, and they're generally just as effective. Actually, a lot of them are conciderably better written; check out
Genesis vs
Genesis. Several of the most common abuses of the spell have been clarified in the psionic version, and the whole thing has more detail and is spelled out more clearly.
Again, I'm not trying to argue that Psions are
better than Wizards. They're not; Wizards get way more totally broken spells, and scribing extra spells covers the gap (at the cost of gp) in spell/power flexibility. There's a very good reason that Wizards are commonly agreed to be the pinnacle of 3.5 power, and the Psion isn't going to topple them. But unless you're Wish-looping or Gate-spamming, it's in the same league.