My console collection is complete.

[masschamber]

Earth Defense Force 2017,
it's cheap, it has co-op, and it is completely nuts.
sure it's a shooter but given the nature of it accuracy is almost a non-issue
It's got giant ants, giant spiders, silly looking robots in both the giant and extra giant variety, saucer shaped ufo's and even bigger giant spiders, as well as a host of other zany '50s sci-fi monsters
plus it has destructible cities, which are a blast to destroy especially with a friend (local co-op only), it has 180 weapons across around a dozen main varieties, vehicles which at first seem worthless due to their oddball and sluggish controls but end up being immensely valuable (particularly the vegalta),
53 levels (including a fight with a cybo-godzilla clone), with 5 difficulties each, with hardest and inferno being tough as nails (for a game that starts out so mindless, it actually evolves into a game that requires careful planning and strategic thinking), a story that if you take it for what it is (a cheesy homage to 50's sci-fi) it is actually really enjoyable
plus it has novice control setting that makes it so anyone can play, even my little sister can play it just fine with the novice controls
Seriously what other game can you set a stick of dynamite in a crowd of giant space ants and then detonate it to send them flying