Since the game is out in Europe since last Friday I've got both the Wii U and 3DS version.
My impression so far:
I can confirm the framerate dips especially in the running sections of the Wii U version. 3 hrs in the game I didn't encounter any glitches like falling through the surface or the like. The game itself IMHO is well made. It looks good and definitely way better than any PS2 title (ok, maybe except GoW

). I love the gameplay since it plays very well like all those good ol' 3D platformers. It has nice adventure elements and, of course, some highspeed Sonic elements. Sometimes they suffer from a low framerate, but I've experienced some portions of those which are running just fine (i.e. beginning of the first world). Combat is not very decend, but still fun. The story seems interesting so far and I love how Lyric has been designed. His voice (German synchronisation) is very deep and with a lot of bass. Sounds great and threatening. A nice-to-have feature is the link with the 3DS version, even though I fully understand that this upsets players with only the Wii U version, especially because the limit of 100 rings to collect while the environment is full of them was a very bad design decision. I also agree that the hub world is a bit empty and 'soulless' especially since there are so few NPCs.
Long story short while I agree with the complaints of the technical side (it definitely lacks of polish, but is in general far from worse), I do enjoy the rest of the game. It's a 7/10 for me so far. A solid action/adventure, nothing more, nothing less. Everyone who loves Super Mario 64, Jak & Daxter etc. and Sanic

of course should give this a chance. Impressions in EU/German Miiverse so far are very well, too.
3DS-Version: after playing the demo extensively and now round about 2hrs in the full game I quite don't get why ppl give so much hate against this version, too. We all can agree that it's not the next Super Mario 3D Land or DKC Returns 3D and yes, the party at Amy's House is a huge letdown, but the game so far is very entertaining. The visuals show a lot of attention to detail. Just have a look at the gorgeous world map, but the levels itself also look very nice. I can't agree with the most saying that they're boring. So far they're very well designed IMHO and I enjoy them really. So far as I can tell it's a well made platformer and also gets a 7/10 from me. Gameplay and visuals are rock solid and if you're a Sonic fan and can arrange yourself with the character design etc., then just give it a try. At least try the demo.
For both games I love the platforming/adventure character with all this stuff to collect. Reminds me of the good ol' days with SM64, Banjo, Jak etc. I agree that some ppl miss the 'heart' of Sonic which is highspeed platforming and that especially in the U-version these parts are not so well made. If you take the game as it is, a new way on looking at the Sonic universe as 3D action/adventure with Sonic elements, then it's fares very well.
Some ppl wondered why Sonic doesn't know Lyric in the 3DS version. As I said I'm not that far into both games right now, but it seems that there happened a bit of time traveling and Lyric knows Sonic after gotten awakened by him in the U version while Sonic can't remember Lyric, too. Also there is a nice comic included in the 3DS version which acts as a prequel to the 3DS version. It is said that Lyric was imprisoned for 1000 years so I suppose that this has something to do with the confusion between the plots of both versions and I think they're connected somehow.
I hope I won't get trashed by GAF now because I'm not fully agreeing with all of you guys. Just give it a try and don't be that harsh because both of them are really well made games. If you love Sonic and platforming/adventure elements, give it a try. Just make sure you're fully aware of the technical issues of the U version, but as I stated above, 3hrs in the only thing I've encountered were framerate dips during some, but by far not all running sections. I'm enjoying the TV show as well and one last thing I've wanted to tell you guys is, that this is clearly aimed at a young audience. I think this also explains why the overall level design and the story itself aren't that much challenging and outstanding. Kids should be able to enjoy and play both versions and when these games would be that much challenging in terms of combat and level design, Kids would lose focus on the game I suppose.
Uncle off for now, going to continue Sanic Boom and I gotta go fast
