It's Xbox 360 actually, not PS3.
And I wouldn't say that particular control scheme is widely used. The reason ME is similar to Gears is because they both use the Unreal Engine 3.0, which was made by Epic Games the creators of Gears of War. It goes a little deeper than that even though. Bioware had never done a shooter before ME, so they asked Epic for help with designing the combat system, which made it end up feeling a lot like Gears of War. Even if ME isn't a console port, (I don't know if it is or not) it will still end up feeling like a console port because Gears was designed for 360 and that's what the combat in ME was based off of. I don't disagree that it probably feels odd on PC, and it certainly isn't the norm for control schemes.
All that being said, it is still 100% possible to achieve maximum effectiveness on PC. Gears 1 was ported to PC, and the PC players mastered wall bouncing just like the 360 players did. I don't mean to sound condescending, and I mean this in the nicest way possible. It's not the controls, it's you. Yes, the controls are probably not at all what you were expecting, and they could probably be designed better for PC. That does not stop you from improving how you interact with the controls, and working out all the kinks in your gameplay, such as taking cover when you don't mean to. I'm sure you're a good player and will master the controls in time if you give them a chance and play with the correct mindset.