Has anyone tried this game out on the PS3?  
I don't have Steam or a credit card so I can't pick it up on there, and I was wondering if it was still an enjoyable experience. 
I've read a review that said there are some frustrations, but are they that bad? 
 
Also, how long is this game?

Well, I've never played it on the ps3, but I imagine the frustration must come from the fact that they probably just mapped the cursor to a analog stick, since this is not the kind of game you can give direct character control at all, so imagine yourself moving a on screen cursor at a set speed with the left analog stick and pressing x to "click".
 
As for length, not very long, 3 or 4 hours at most, but it is very good, I liked the first one way more than I did the second.

I've played it. It's not as bad as just a straight port with the mouse=left stick but it's close. Most of the time it wasn't an issue but there were definitely some times I wished I had a mouse. I had some sound problems as well.

And yeah, it's not very long. It also doesn't have much replay value. The story is great though, and some of the puzzles are challenging.