So you prefer to just run & gun down everything? I don't know ... sounds kinda boring in the long run. I very much prefer shooters like ArmA 2, where taking cover is all the difference between "living to see another day and potentially maybe even finishing your mission" and "getting killed by a snipe you didn't even know was there from over a klick away."
I like having to use cover in shooters like STALKER. It's nice having to be tactical about it, so you can't just rush straight in.
In the case of Mass Effect though, and Gears of War and many other games that people call 'cover based shooters', it's pressing a button to hug a chest high wall that is almost guaranteed to block all damage while you wait for health regeneration to kick in. Pop out, shoot, take cover when taking damage, wait a few seconds for health regen, pop back out again, etc. etc. While in STALKER or ArmA 2 if you're crouching behind something you don't know if it's entirely safe, so you have to guess for yourself what you can hide behind, and health doesn't just regenerate.
The cover based shooting with health regen isn't that fun.
They're not even doing that! That's the work of Overhaul Games and Atari.
True, I'm only mentioning it because the originals were made by Bioware. Or something like that.