For me, this was one of those "Oh snap! I played this as a kid and it was AMAZING, let's play it again!"
aaaaaand then I realize that it hasn't quite aged very well. Don't get me wrong though, this is still a positive review. I'm just being honest with myself. It looks pretty muddy, the controls aren't that great and overall? We've just done much better in the realm of 3rd Person FPS games since then.
HOWEVER. It is still a hilariously original game with memorable characters (the tea drinking, british centurion robot is my favorite) and it's still very playable. If you want to revist some nostalgia? I say it's worth the price. If you've never played it before, you'll probably be a hate-it-or-love-it type of person. It might be too archiac for you or it might be just right.
For me? it's a classic gem that may not have aged super well, but it's still an entertaining and memorable experience.