Crysis 2 isn’t like other FPS games. It’s not like COD where you just run around shooting people, I’m not saying that you don’t need a strategy to do well in Call of Duty but all it is, is you and your gun and nothing else. In Crysis 2 you are equipped with a nanosuit which possesses nanosuit abilities. This leads on to my first tip, use all of your nanosuit abilities. You can use one more than the other but it is important that you use all of them. If you don’t use all of them you are going to get beaten time and time again.
A lot of people might not think this but I do, this is a very important tip, do not get distracted by the awesome water animation. On Skyline, I once sat in a corner to recharge and I got distracted by the water dripping off my visor and I was stealth killed. It might not seem like a big deal but you could be about to collect your 7th dog tag.
Understand the maps. This one can apply to all first person shooters but in Crysis 2 it is especially important. If you are low on energy you’re going to need some where safe to recharge, you don’t want to be caught with your pants down in the open.
Never shoot whilst cloaked. A lot of people didn’t know this one at first but if you shoot whilst cloaked it will drain all your energy, this goes for grenades and melee too. Handguns are the only weapon that doesn’t completely drain your energy. An easy way to switch out of cloak rapidly is to switch to armour, you’ll probably be getting into a gun fight anyway and it protects you from other enemies around you.
This one applies to other first person shooters but again, I think this one applies more to Crysis 2 because of the nanosuit. Choose your modules wisely, they can help greatly with your nanosuit.
A lot of people don’t like the idea of cloaking too much in Crysis 2. Some people say it’s like camping or it’s noobish or some people just aren’t used to it but it’s not. The game has given it to you, use it. If your opponent isn’t using it you’re already one step closer to killing him and not getting killed by his team mate.
Watch Crysis 2 videos. Before I got Crysis 2 I drooled over it watching commentaries and tips videos. It will improve your game even if you don’t realise it.
Finally, play the game. With experience you’ll know what the best attachments are, what the best modules are etc. Over time you’ll also know what cloaked enemies look like and understand the maps more.