Rising is very very different to any other MGS game. Fair warning. I recommend every MGS game wholeheartedly, but don’t play Rising and then pick up Snake Eater or MGSV expecting it to be more of the same.
I mean for example in mainline Metal Gear Solid, Raiden is hated by absolutely everyone to such an extent that they made his MGS3 counterpart gay as a horribly aged joke (It was the early to mid 2000’s, people accepted “the gays” enough to actually acknowledge our existence, but not enough for homophobia to not be so incredibly normalized that someone being implied to be inferior for loving cock was a normal punchline)
Metal Gear Rising Raiden, is however, fucking awesome.