Holy stem Batman.

Not only that, hes got the brakes on still

The air shock works well, but i think it would be better with coil, or maybe a PUSH tuned air shock that suits the bike. New forks would be a great upgrade if you wanted a more gravity orientated bike. Some 66s or Lyriks. Dont go over 160mm of travel though. The frame is suprisingly robust. Obviously it has limits but it'll put up with a lot. Wheels are a good upgrade, some Mavics or DT Swiss rims are a good place to start, then Pro 2s or Halo Spin docotrs seem to be a standard hub to go with (Or go NS as they're polish too, i think..). Cranks should be okay. Don't fix them till they're broken i guess is the motto there. Chainguide is very much what you like the look of, they all do the same job at the same price.