To be blunt, Hideo Kojima begged the developer of Super Smash Bros. to put Solid Snake in Super Smash Bros. Melee, but they couldn't because the roster was full, so they guaranteed Snake a spot in Super Smash Bros. Brawl. Now think rationally; if he begged them to put him in Super Smash Bros., why would he do the same thing for a completely new game that just happens to be the same genre as Super Smash Bros.? Since Snake is in Super Smash Bros., it makes perfect sense to have Raiden in PlayStation All-Stars Battle Royale.
He is a perfectly worthy character, because if he wasn't, why would hundreds of thousands of people beg for a spin-off of the Metal Gear series just for Raiden?
I don't hate him. It's just that Snake deserves more the spot. It's like if in the next Smash there's Luigi but not Mario. Luigi is good, but Mario is Mario.
Also, his inclusion stinks a lot like an advertise thing, and that sucks.
Anyway is not even remotely bad as Donte.
Guts (berserk) " I've never expected a miracle. I will get things done myself. "