Peak Raiden is pretty broken. His handling of Excelsus puts him solidly above basically anyone on the MCU Earth strength-wise. He's faster than everyone except Quicksilver, and he's got a sword that cut through opponents on a molecular level. I don't see who can stop him. Maybe Vision by going intangible and attacking from a distance?
Speed kills, and Raiden at his best is faster than any MCU character, while having immense physical strength at least on par with high tiers in brute strength like Hulk. He probably has better strength tbh.
He is, however, essentially just a brick. I'd say he can potentially beat Thor, but Thor could net the win by exploiting Raiden's more limited arsenal. If he could trap Raiden in a thunderstorm like he did the Destroyer he would win, for example.
Never played Revengeance, but played through MGS4 and seen enough Revengeance gameplay to know Raiden should ghetto blast any one in the MCU up till your Ego/Dormammu/Thanos types. So agreed with Arachnid, NemeBro, and Psychotron thus far. Only outliers are Quicksilver (go into uber speed mode and try to rip Raiden apart), Thor (fly high into the sky and spam lightning and tornadoes), and Vision (immediately go intangible, fly up high, and spam mind gem blasts).
I'm wondering how far MGS2 Raiden can go? If Raiden has his game mechanic armory that he can pull out of thin air, plus a ration equipped in his lower left-hand corner slot, he could take down the street levelers I bet 😎