[i]Seeing the YMS review about it being almost purely referential humor aside.[/i] My housemate is supposed to see it this weekend. (And he enjoys just about everything.) So I'll have secondhand knowledge about it soon.

But I never watched the old cartoon. So I don't have nostalgia, or a particular reason to go see it. (Though I watched Sonic 2 last month or so. (Thanks to a friend's enjoyment of the first one.) And that movie was not very good. (In fairness its target demo, seemed to be very VERY young kids.) [i]Especially, when the internet claimed it was focused on Sonic & Pals.[/i] It wasn't.
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"The Bad Guys" was a perfect representation of an average 5/10 animated movie. (With me being a bit disappointed by the internet claiming its humor was anything like "Shrek".