Hmmm, Checkered Flag is bad - but I like the aspect ratio and the turning map (also in AvP), which was pretty unommen at that time.
The controls and framerate are dull.
Skyhammer had a better framerate than AvP IMO and you should consider that it was never released officially by Rebellion.
AvP ... I really like that game. First I was very dissapointed by the framerate, after it was 8 months delayed
And I played Wolfenstein 3D and Doom a lot before.
But after getting a little bit into it I started to like it.
Now I've heard that the pathfinding algo is a bit weird, all the enemies keep searching you all the time on all levels (if that is true).
The prototype-version is a lot faster from what I've heard.
Well, and it has a higher resolution than Doom, was 16-bit colour (like Doom) ... was there any other (tactical) FPS in 16-bit colour at that time?
For that it's pretty good.
I also like that there's no music, but great atmospheric sounds
About that save function, where all enemies but also ammo and health packs etc. are respawned - I always tried to find some "tactical save places".
And Aliens Versus Predator (PC) was also cool.