It's as much to the Third Party Shooter as Oblivion was to a First Person Shooter.
Answer: you play it how you want. Like others have said, if you want litterally no shooter elements, you can do that with playing as an Adept, Engineer, or anything focused on Techs and/or Biotics. My Vanguard (the most well-balanced class in the game) got extremely anti-gunning near the end, with the fact there were so many biotic powers to use.
Of course, you can play it as a full Gears of War-type shooter, but thats merely optional.
Don't let the TPS elements dissuade you. Just pick it up, and enjoy what is a phenominal RPG.
Back from the dead, I'm afraid.