Halo: Reach

[Jean-Luc]

I mean, they only revolutionized the genre with their unique touches and sold millions of copies of the games while doing so.

I could do a horrifically detailed and angry rant about the bold statement, but I'll keep it a short answer. I don't think Halo revolutionized ANYTHING other than having recharging shields.

That said, you are right about Bungie having a tried-and-true formula, and it definitely wouldn't make sense for them to change it, at least not much.