When having the tank enabled in mp, especially in BG, it is ridiculously over powered. I don't have a problem with it being immune to regular gun fire (hell, it's a tank it should be), my problem is the cage top that covers master chief is now solid, instead of bared like is was in halo 1. Now that it is solid, it is impossible to snipe or shoot master chief out of the tank. Even grenades are virtually worthless against the tank; I threw 10 frag grenades underneath the tank, and nothing. The only thing that will take it down is 2 well placed rockets, 4 or 5 blasts from the gauss gun, and two shots from another tank. Then there is always hijacking the tank which is impossible when the tank is too far from the base, especially when everyone spawns near the base there is not enough time to get close to the tank before it kills you (I do realize that the solid top cover can be blown off, but to get to that point is almost impossible).
Bungie should have left the top bared on the tank, because as is we do not play with the tank anymore.
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