I make it a point not to know anything about these things before I watch them so I can go in with no preconceptions.
Nobody's going to mistake this for high art, that's for sure. The acting was amateurish, the scene choices were questionable (going from normal environments to checkerboard and loop Green Hill, wut), and for a movie allegedly about Sonic, he was absent for far too much of it. I felt for the length that the movie ran, it had too much dead space; either more should have happened in the plot, or the movie should have been shorter. The CGI stood out noticeably with Sonic and the robots frequently not even casting shadows. I don't think it would have killed them to have Robotnik's mustache at least be long enough to stick a little off the sides of his face, either. Jaleel White hasn't voiced Sonic in over a decade, and you can tell. A few parts were well acted, like the banter between him and the female GUN soldier (where he thankfully seems aware of how awkward him hitting on a human female is, which hasn't always been the case), but in the fight scenes his voice seemed really flat and forced. Probably the biggest flaw in the movie is that there's no real climax or resolution, it just sort of stops, and right as things were starting to happen.
That said, I have to keep it in perspective that this movie is being done for fun without any hope of profiting, and without any assistance from Sega. And that, unfortunately, I have seen "professional" movies worse than this one. I might have actually found this enjoyable if it was the first part of a series or an extended teaser rather than being the entire movie itself.
Also Egoraptor voiced the E-100 series, and that's awesome AWESOME.