Off the top of my head it was probably SOCOM 4, there was nothing "SOCOM" about it. It was pretty much a new IP with the SOCOM name.
Ah yes. Both that and Confrontation were enormous disappointments. I just don't get S4, at all. Zipper basically had a chance to save their skin and make a hit this gen. And they blew it spectacularly.
There needs to be another thread for most overrated games too