Honestly, I liked the Mako. I never had a problem with it, to me it handled like the jeeps from Halo, which I was money with. I thought it was fun and I loved jumping missiles and finding paths up impossible angles.
On the other hand I hate the Hammerhead. It was glass and it's missiles were spotty at best. It had no shelf life for me, as pointed out earlier it froze up on a planet the Mako would cruse over no problem. Also, I could get out of the Mako on a whim, not so the Hammerhead; thanks for taking my option to stand on a planet when I want... and don't get me started on the way the thing's "health" or lack thereof works. BEEP, BEEP, beep a little faster, oh no I'm on fire, and dead. I just lasted thirty seconds on normal against two turrets; thanks for that. I didn't know I was about to explode. Often by the time you know you're in trouble it's too late, you'll die.
I would love the Mako be brought back, or even something in the middle, just please; no Hammerhead.
My two cents.