Campaing, was great... not brilliant but great. Long and enduring, yet the first few... chapters or acts w/e were somewhat dull and boring until you start getting your upgrades. However once you get enough and you replay them, that changes completely.
This game was quite a surprise and one that I just bought after returning my rent. I buy very very few games but this one is one worth buying to show my support.
In the end I hope in the future a coop of some sort is added as it seems very lonely to just blast everything yourself. And while some might have a point on stating that it would break "plot" or "story" I personally do not mind. Even if the other player is a ghost never to be acknowledge, the presence of a friend would greatly increase its replay value (both on the same console and online coop). Some minor glitches here and there, and the inability to have some sort of great reward after hard earned nano points like a cheat menu that is unlocked after game has passed would have been nice. Some of the features could have included infinite stats for weapons or energy would have made the game's replay value even higher.
Now to give a quick praise and slap

The feature I enjoyed the most was the tactical visor... but at the same time is the one I detested at its best. Not sure why I had to press X to highlight and keep track of every single enemy... at the beginning is nice and engaging but later on is annoying and feels more of a chore than a tactical choice. thought the onboard navigational computer would do that for me of course.
Lastly... something I forgot to mention... when it comes to bad things. Was that , and yes I know you can't go base your opinion on trailers, but I was expecting to be able to disarm enemies if you approached them from the front and you were undetected, like it was done in the trailer. Nevertheless for those who might say "that is lame" " can't be done" etc, is kool, and it has been done in a game call Timeshift.
PS: Not something of a priority but would love to see it implemented in the future:
-Not to limit nano suit enhancements to 1 per tree, but allow all ones bought to be used at the same time, and turn off the ones that bother you too much. Now maybe this feature to be available only ONCE the game has been completed in... veteran at least
-Ammunition. While I know there are plenty of crates, being able to carry ammunition in normal numbers for all weapons would be idea. not sure why you can only carry 4 clips.... sort of selling it self short but still.
-Dont limit the grendel... great weapon but in higher difficulties it has just too little ammunition
-Driving, if you want not something really needed, but improve driving.
-Cheats unlocked through passing the game: Ideas are plenty as you can imagine, double energy double ammo, infinite energy infinite ammo (latter two maybe only if someone passes the game in supersoldier)
The last stated however was relatively minor, the core of the game is great. Brilliant job at the studio and good luck in future installments.