Tons of fun, the psi powers are a great innovation making Psi Ops a very good game.
The graphics are not something you should care about while playing such a good and addictive game.
The character you play with,Nick's a normal guy, only he can kill you with his brain. Trained by the Government's Mindgate department, Nick is a telekinetic telepath who can also disembody himself and float through doors.Which is awesome.
There are many kill mods, set somebody on fire, throw objects at him, or the other way around.
Another power is the mind control, which is also very fun, you can make your enemy suicide and move on unhurt.
This is also the first game in which, some cheats are very fun, like the model changing, I played most of the game with the Scorpion model.
There is also the freedom (training) mode in which you can test out your powers (which you have to unlock while you play), and few other more modes like gnom hunt, going somewhere passing thru' huge gaps in the ground, and many others.
The level design is very nice, most of the game takes place in indoor areas, military bases and so on.
I suggest you to get the game :).