"What's more Mass Effect is an RPG by one of the top RPG developers on the planet."
And Bioshock is a first-person shooter with RPG elements by the same team that made possibly the most revered game of that type of all-time (System Shock 2).
"Mass Effect's wide open squad-like based combat:"
So because you're on a flat plain, the combat is "wide open" in some amazing way? But if you slapped some walls down around the combatants, then WHOA, now it sucks and is repetitive?
Here are some shots of the amazing varied gameplay of Mass Effect:
I'm still baffled as to how you think Mass Effect's "have this guy throw a grenade, have this guy use telekinesis, have this guy shoot a laser gun" is so awesome, but Bioshock's "teleport over there, program that security droid to attack your enemy, light that teddy bear on fire, use telekinesis to fly it at the enemy and light him on fire, then send electricity into the water he's standing in to finish him off" is so repetitive and lame.
The combat of KotOR or Jade Empire (to say nothing of Baldur's Gate) was hardly some tactical thrill-ride, or deeply satisfying. Long before reaching the halfway point in those games, the combat was as mindless and repetitive as any FPS (and far less visceral and satisfying).