The last kaiju mash-fest I ever played was Godzilla: Save the Earth for the X-Box, which was a sequel to Godzilla: Destroy All Monsters Melee. It's a fun monster mash fest that is kick to have. Though I've been hungering for an updated version of this. Sure enough, Bandai appears to have answered the call and is delivering possible ultimate mayhem with their Godzilla (just that surprisingly no add-on title with it) for the PS3/PS4.
Here's the trailer they've shown at E3:
Yes, they got poor Heisei Era Mechagodzilla mixed up with classic Showa Era Mechagodzilla. But given all three Mechagodzillas and Jet Jaguar are in this game. I'm not gonna cry foul. Instead, I'll PUNCH PUNCH PUNCH opponents when this game is released in July (hey just in time for G-Fest 2015!!!).