What's a good tactic for the last boss in Crysis 1

Answer 1

Destroy the turrets with rockets that you can find on this level. Then use the TAC gun you got earlier to lock on and fire. Take plenty of cover between shots. Make sure you take out the flying sentries too.

Answer 2

Here's a guide for the final boss: http://guides.gamepressure.com/crysis/guide.asp?ID=4001

Its a pretty good guide