Dunno, the driving was annoying but not a major issue for me, I often found something else to do while I was driving somewhere (such as a building that looked like it needed a good wrecking or running over propaganda).
Isn't the sniper rifle an end game weapon? I didn't find it before I was in Eos and it looked like it did more than just change the color of your reticle if you point at an enemy (aim the weapon with the stick click, that way you use the scope).
Anyway, terrain damage doesn't really matter to me, if you look at how good ground is at absorbing blasts in real life I don't think you'd really get much done anyway.