3) No, don't like the rules or psionics generally.
5) No, doesn't fit in with the current campaign theme.
Psionics just comes off as a varient magic system. I am REALLY starting to dislike systems in which you can only cast X spells per day. I'd rather see a system in which you can cast untill you are exhasted or something like that.
Other than that, i do own the book, but i haven't really bothered to flip through it too terribly much. The half-giant was one of the initial turn offs. wtf is with bonus pp? doesn't fit with any half giants i know of (and yes, i do know that that is a Dark Sun race, but why WOTC pigeonholed em so much, i don't know).
I am currently running a FR campaign in whihc Psionics will not be featured in any way, mostly because i don't like em as is. IMC, they have an even less of a hold; infact none.
IMO, Psionics are simply a modern, pop culture thing whihch have zero basis in the presumed medieval fantasy world D&D is suppoedly portraying.
If you like em, power to ye. As a DM, i would never include them in a game. As a player in a campaign which allowed them, i *might* actually be tempted to try a Psychic Warrior/Fighter and possible Barbarian build, but that's only if i didn't go for one of my regular builds.
cheers!