Yeah is annoying, especially with how powerful the Havok now seems. It can just hover in spawn shooting stuff!
Had that last night was playing on rush server damavand peak attacking the first set of objectives kept getting done over by the chopper. Loads of snipers just sitting back looking for easy kills, quick shout to get them to snipe the pilot, nothing.
So i just pulled out the trust L96 and did it my self killed him three times in a row, kept his distance from then on and we managed to push on easily then.