How much of crysis 2 is played with friendly ai? (as in you have teamates/allies versus being a lone wolf)?

Im thinking about getting Crysis 2 mainly for the single player, and I don't like having to "go it alone" meaning its just too tense.How much of crysis 2 is played with friendly ai? (as in you have teamates/allies versus being a lone wolf)?
crysis 2 is a beautiful, engrossing experience that avoids the anemic, scripted playbook made law by the 500 pound shooter gorilla. It plays well, encourages creative problem-solving, and confidently delivers a series of escalating and changing encounters and scenarios that will push you to think in a way few shooters have in an era of increasingly funneled experiences. While Crysis 2 loses its footing during a few odd moments, Crytek more than delivers on the promise of their previous games.