TheLostGenius wrote...
Does killing in the Mako reduce EXP? And if so is a Thresher Maw defeatable on foot!?
I believe blowing things up with the Mako does reduce your XP gain, since it's easier to kill things when you're in a tank (no matter how badly it handles) than it is when you're on foot. That said, it IS possible to beat a Thresher Maw on foot, you just need help from the Mako.
Specifically, pound the TM down a few times until it's reduced to a sliver of health, then pile out of the Mako and unload on it. Circle-strafing is probably the best way to do this without getting killed.
That said, I'm in the middle of the Geth Incursion assignment and the Geth Colossus on Antibaar is a complete and total pain. Currently I'm playing a Vanguard on Hardcore difficulty. After quite a few failed attempts, I eventually broke down and just killed the damn thing in the Mako. And this was after doing the aforementioned killing-a-TM-on-foot bit on the very same planet! I was able to drop the two Geth Primes on foot afterwards, but most of the other Geth got cleaned out by the Mako. I was just too tired and frustrated to worry about wringing out every little bit of XP from the encounter. In this play-through I'm 35 with plenty of assignments between me and Virmire. The goal is to hit 50 at least, and unlock Insanity for my fresh Infiltrator start. I anticipate two play-throughs there, so he can hit 60.
OT: At this rate, it might be possible to hit 60 in one play-through, but I'm not planning on it.