I remember playing the first Nights game when I was pretty young. I never played it on the original console, but I could still play some kind of demo on a random gaming site (the type of random gaming site where every single eight year old will spend hours and hours trying to beat his classmate's highscores instead of working on school projects). I kept playing that game, not because it was fun, but because the music was freaking catchy. That's the only thing I know from Nights : catchy music.
When my friends gave me the game for my birthday, they told me it took them a long time to make their choice because they wanted to make sure I would like it (basically, they think I like she-males). The next day, after my birthday party (we basically got drunk with cream soda and played D&D until my parents went crazy), my friends wanted to try it out. We put the game in the Wii and watched the introduction movie as we always do. Right when we watched it, we knew that the game was going to be pretty pointless : nothing at all happens in the freaking movie. The only thing you'll see is Nights, flying around. He/she does nothing else than flying over mountains, rivers or plains. Basically, it represents the spirit of the game : you'll fly, and that's pretty much it. And you'll fly in two dimensions.
The game starts with some nice-looking choice of storyline : you get to choose between a boy's dream or a girl's dream. However, when you try both stories, you discover that they have the same missions and stories, with some rare exceptions. The gameplay will remain the same thing, you'll earn the same power-ups at the same time and encounter the same characters at the same time too. In two dimensions.
Speaking of the storyline, it's not very satisfying either. The basic concepts are pretty interesting, even if they're a bit kiddy, and fit pretty well with the character of Nights. Sadly, it keeps being very neglected and most things that happen during the game don't make much sense. The best examples would be the boss fights : at the end of a mission, bosses just spawn in your face with no explanations and you have to defeat them. Twice. Not twice in a row, but they'll spawn in your face two missions later. And they're boring. You'll understand what I'm saying when you'll be "fighting" the witch and her cats. It's not even a fight, you'll just flip some kind of crappy game board, trying to throw the cats in the holes. The boss won't even attack you, she'll just stand there and watch you kill her. In two dimensions.
The missions don't really have any link between them either. Every once in a while, there will be some kind of evil twin that will appear, do some evil stuff and then go away until you reach the next chapter (what's that obsession with making an evil red and black alter ego of your characters, Sonic Team?). For the rest of the game, you'll just fly around (in two dimensions), trying to go through rings and boosts, making loops around enemies. No, you don't have to attack them, just run into them and press A. They won't even attack you.
The game won't really give you any good feel either. The visuals are a mix between a botched Gamecube third-party and a Nintendo 64 graphic glitch. Apparently, more and more people are underestimating the Wii's capacity : all the 3D the Sonic games I've seen had great visuals. Maybe the gay animations in the background sapped the graphical capacities.
At least, Sonic Team included some kind of replayability attempt. They put everywhere around the world some cute little inhabitants, the Nighttopians, that really look like a bunch of Chaos on drugs. While you're doing the missions, you can capture them and bring them in your own world, which is called "My dream". And it sucks badly. There are almost no options with My Dream, you can barely interact with the Nighttopians you caught and there's not much customization with your world either.
The game sucked so badly that my friends apologized for giving it to me and gave me the bill. I went to the Future Shop, got refunded and bought Bully instead. No regrets. Still, even if I really hated that game, I suggest renting it if you think you might like it. I have to say, the level design was pretty cool on some missions. It's a pretty simple game, with not much options, but still, it might be enjoyable if your tastes differ from mine. And if you like she-males. In two dimensions.