I downloaded the demo and wasn't very impressed.  Is the actual game anything like the demo?

" Nope, the full game is actually a Top Down RTS with some fantastic coloured lighting. (seriously what is going on here?) "

As a general rule, if you're "not very impressed" and the game didn't get rave reviews and you also don't have a group of people to play with immediately, chances are it's not worth too much.

Note that having no reviews might mean it got overlooked (Portal fell into that box when it first came out).

" @onarum: Then its the most abstract attempt i've ever seen, its not even like he's trying to sucker us or get our blood boiling its just...Weird? "

Wut.

not trying to troll, just wanted to know if it runs fullscreen and plays like a normal fps, is that really too much to ask before i buy it

because in the demo, it doesn't do either

" not trying to troll, just wanted to know if it runs fullscreen and plays like a normal fps, is that really too much to ask before i buy it "

like wasd controls and stuff.  Sorry to offend anyone.

" like wasd controls and stuff.  Sorry to offend anyone. "

It's a lot faster than your average modern FPS. What are you talking about?

Someone doesn't know how to turn mouselook on! 
 
PS @onarum: You've clearly never played it online.  The Quake games play at breakneck speed compared to modern shooters.

The lack of technical information in this post and the replies is painful. 
 
It runs like crap because it's most likely on the software render instead of OpenGL.  You can find that in the options as well as the ability to enable full screen and mouselook.  Of course, even though the game is old it depends on what you're running it on.  If it's a laptop with an Intel GMA video card, it's going to run like crap regardless because that chipset, put nicely, is absolutely terrible.

Even if you're not very excited with the main game, Quake II had a pretty huge community, which means there are a ton of mods that you can go through. Action Quake II is one such mod, and it remains one of my favorite multiplayer experiences to date.