Daedalus1138: Thanks for the replies. I'm now seriously debating whether I should get the game. Can anyone think of any comparisons (excluding Left 4 Dead)? The zombie mode thingy in the more recent Call of Duty games, perhaps? I found that fairly enjoyable by myself. I also like Battlefield 1942 and Quake 3 singleplayer, despite them seeming somewhat pointless when played in singleplayer.
I'm mainly trying to get a better idea of why the singleplayer isn't that great.
Screw the SP, one thing this game HAS got going is one hell of a community. When people talk about PC gamers being more mature (rare cases), I point to KF. There are a lot of incredibly helpful and funny people on the game. Add to that a great deal of community driven feedback on patches and updates. Though I liked the L4D series, the community is one that can be summed up in one word:
shitstain. Vulgar, competitive to the point of abolishing sportsmanship, angry, whiny and advertising that they are nothing but a bunch of basement dwellers, even COOP has been infected by the gunk.
L4D is incredibly easy as well, KF IS a survival wave 'type' game, but has a very good scalability difficulty wise and higher levels do offset the gulf Hard or suicidal poses. People communicate in KF, whilst in L4D, you'll be lucky if one person does not actively ignore you.
The good news is that KF is very beginner friendly, there are plenty of servers for a novice like you. Only four waves, weak enemies, no super end boss and you can ask for all the help you want, people will be glad to answer. I really don't like the steam forums much, but the KF section is very well behaved and full of people that are willing to help. If you wish you can make a few threads and further collect even MORE reasons to buy the game.
SP is basically practice mode, which is why it 'sucks. But I don't think so since you can get a feel of the levels, guns and how much money you gain from each enemy kill. Before embarking online. Every official map is accessible offline to practice tactics, weapons, booby traps and good defence locations.
Is there any story to the game? Nope, the game is a pure survival shooter. Enemies attack in waves, you get to build your levels and classes up ( which are well integrated by the way) kill them all and the level is ended. That's it. I think you can also build up your class levels offline as well, though I haven't played for a long, long time, so I can be wrong.
The level AND server mods are insane as well, 50 man DOOM 2 playthroughs are something to be experienced. In fact I only usually play on 50 man servers now, since they can be incredibly fun and funny.
I do think KF is the perfect online shooter for beginners, since the system it uses is rewarding, the difficulty levels satisfying and challenging, the levels very well designed and the community amazing.