He's Right.
Psychonauts is one of the most interesting original games I've ever played. If you don't own it, go buy it. It never stops being entertaining.
He's right on some of the difficulty spikes. There are some times that I was like "Jeebus!"
Parts of the Lungfish bossbattle was some of the hardest platformer boss battle stuff I've ever had to play.
It's very intersting in how it catches you off guard. With this type of cartoony game you get used to expecting to hear certain things, and never hear others....so when someone mentions how someone committed suicicde, using that word, suicide, it slaps you in the face. Not in a bad way, but you make note of it. And at one point you're in someone's mind projection, and happen on to a secret room (if you look for it). Inside you find out that they once had children and that they were burned alive in a fire. IF that's not enough, you pop open a secret doorway and are warned not to enter it because it's a real "party killer", because the whole theme so far as been super light and happy and celebratory.
Inside the secret door you're dropped into a hellish burning room where demonic spectres wail about burning alive and why they weren't saved in creepy voices.
Keep in mind, I'm not saying that because I think it's bad. In fact I was highly impressed that the developers did it. As a writer it caught me as a very honest move. They didn't pull punches, they told the story.
So again, I deffinitely suggest it, the way I'd suggest Fitzgerald, King, or Faulkner to an english major.