Crap
The only good thing about this movie was the music. You have ruined Sonic worse than Sonic Heroes ever did... And for the love of god, when characters turn transparent they shouldn't start showing all their parts. Now, neverminding the transperency issues, the animations sucked, just repeating over and over, the characters looked rediculous (wtf happened to Shadow's eyes?!?!? They used to be cool!), and the bad guys were even worse... (Metal Emperor looked like a total wuss, along with everyone else).
The list goes on: Knuckles falls off a wall for no reason at all (not to mention the wall also looked like crap)
Sonic's not running nearly as fast as he should be, even when he speeds up
Mighty looks like a retard (along with every other character)
In fact, I need to say this. YOU DESTROYED SONIC'S COOL FACTOR! YOU CRUSHED EVERY OUNCE OF THE HEDGEHOG'S RESPECT! YOU KILLED SHADOW SLOWLY AND BRUTALLY AND LEFT HIM WITH NO DIGNITY! DON'T EVER MAKE ANOTHER FLASH MOVIE AGAIN!