It is, in my opinion the best shooter and it paved the way for the shotter's we know and love today
The pistol is fun. I played the nearly played the whole game with pistol. And the percussion rifle is cool, too. In multipayer Give me a pistol and a P. Rifle and no one can frag me. I like the shotgun, but it's really not the most effective weapon, but it;s fun when you get a lucky shot and blow someone to a pulp with the auto fire.
There are 3 glitches that are noticable:
*You can tunnel through on multiplayer into another level. (you'd have to get the first release one's or it doesn't work, or so i've been told.)
* Shoot a rocket where there is no ceiling and it will fall back on or near you
* look in the Hints & Cheats