Sonic and the Secret RingsWii

This is a fantastic game given time. Sonic might be a bit sluggish and hard to manoeuvre at the start of the game, which is a drag. But once you've cracked into some of the higher Skill Levels, this suddenly becomes amongst the fastest and most tightly controlled Sonic games out there. A bit of a shame that it takes a while to actually get there though, and there can be a few pretty scrappy levels, particularly on the "Collect no pearls" and "Take no damage" challenges. Sega seem to take the opportunity to cram these with unfair amounts of pearls or hazards sometimes. But there's a mere handful of those, and I don't think any are required to be played in order to complete the game.
The game is pretty enormous too, with tons of challenges, 7 (iirc) unique worlds (with around 15 short acts apiece and 1 long one), over 100 hidden skills to unlock, a multiplayer party mode (it's pretty meh, but it's not horrible. It's pretty big too). For the completionists like me out there, many challenges also contain 3 hidden Fire Souls to track down (with over 120 to find in total), and every challenge has the difficult task of getting a Gold Rank on them. It'll keep you going for weeks.
The voice acting, unfortunately, keeps the tradition of being pretty god-awful. I suggest switching to the Japanese voice acting in the options, it's much better that way. Everything is subtitled in English, so you won't miss anything. The storyline is pretty corny at points (anyone who's seen the final cutscene will know exactly what I'm talking about), but it doesn't infringe on the actual gameplay, and you can always skip the cutscenes if you don't want to listen to it.
I'd give it 8 out of 10.