Yeah, against Tyranids its way better, but i'd still go with some naughty stuff, like Dark gate, orb of despair, Casket of flenssing.
IMO the haemonculi are not the killer HQ type, who ters the enemy apart in CC. They give FnP to a vital squad for 50 points, and thats it. Anything more they achieve is a bonus.
So when the unit disembarks from the raider, the haemo can stay inside with one of the toys above, and threaten the opponent. I know not to wait too much from him, but each of those wargears holds the potent of mass murder, therefore none can just let him wander the table, he'll magnet fire until he dies. Either if he takes a few lascannon shots, or he makes some damage on the oponent, it seems a nice deal to me.
Even better, when he deploys WWP. After 12" move, he gets out of the raider and puts down the portal. From this point, he would be pretty much useless and slow, but with one of these he still have a trick in the talon, not to underestimate.
Thats my opinion, what do you think?