It's up at the UK PSN (US on Thursday) and free. Took a LONG ass time to download..
Well I played through it once offline single player.
The good:
The gameplay feels good, weapons have a nice feel. Characters don't take a million shots to die. Basically used two types of rifles which really felt almost the same. Tried the pistol briefly, why is is so slow? Or am I doing something wrong.
Melee actually felt pretty good while on the nektar, like it had some weight to it. Didn't try without the nektar.
The Framerate is solid, never dipped even with a lot of guys on screen (not shocking though considering the static environment and average at best graphics). No screen tearing either.
Nektar graphical effect when overloading was kind of cool but would probabl get old rather quick. I could see it being fun in multiplayer.
The bad to not necessarily bad just not good:
Graphics = rather bland but long draw distances at least. Vegetation is lifeless, textures aren't that great aside from one log type that seemed higher res than the rest of the stuff. Even the color palette wasn't that great for being a jungle. Maybe I've just been spoiled by Uncharted, Halo 3's first level, etc but this is nowhere close. Weapons look last gen and pretty generic as well.
Level design felt almost felt like I was playing the Jungle level on 007, yeah that linear pretty much. Though 007 has better layout. Enemies are harder to spot, almost requiring use of the nektar to lite them up. Not really a fan of playing with the characters lit up either, just seemed gimmicky. Really over all it was just rinse repeat, rinse repeat similar to Halo campaigns. A.I. didn't seem anything special at all though I did get melee'd once at least.
The dialog was pretty stupid IMO, though I did laugh at dialog from the guy in the plane at the end, just because it was so stupid it was funny. I think I can say the second half without spoiling it nice pause for dramatic effect then "semi-pro" lol, that was the most memorable part
Overall the demo left me with little desire to play again. I hope that is just one level with poor level design.. I will try off and online co-op just to give it a fair shot.. In general I think multiplayer could still be a lot of fun as I do like the gameplay but unless they put something out for free to try that I'm not buying.
edit: for the demo they really should have demo'd a level that lets you use more weapons like the rocket launch, throwing knives, etc.. People love rockets and knives, those could help sell the game.