Bought the full game too on account of my enjoyment of the demo.
All in all its fun - balanced, great MP, and great SP - but I think there are a few tweaks that could be made to spice it up a bit. The weapon sounds are only average, the dialouge in the SP is only bearable, and there are still quite a few small bugs to be worked out (getting stuck in certain locations, etc).
That said - the SP game provides great atmosphere - from the sounds of the jungle to the late 60's soundtrack, its kind of like playing a game version of Platoon or Hamburger Hill. The visuals - especially from the air when transported by Huey's, are astonishing - they really did a great job.
The MP has good maps (few exceptions), good game types (ATG, CTF, RW, DM, TDM), and with support for up to 64 players if your server can handle it, there is some real potential for fun. Big plus is the radioman class - arty on tap.
