Well, ok, I haven't played the game yet, I haven't bought it yet and sadly I'm not planning to. *Sonic stares at me with angry eyes* Sonic don't cry! Here I'll explain everything bad about this game!
1. Sports Game
Ok seriosuly. Doesn't Sega know that we are tired of hitting balls with giant golf clubs or hitting a dice and walking through some round holes and then collecting coins or tackling your best friends just so you get a freakin' soccer ball? Well, Sega: WE HATE SPORTS GAMES! The sports game were fun at first (Mario Party 2 was actually fun) but then they were just annoying.
2. The fastest thing a live.
Mario & Sonic at the Olympic Games proves that Sonic isn't fast at all. Sega just wants him to look fast in his games. I mean seriously! The big fat old Mario is faster than the blue teenager hedgehog called the fastest thin a live! Bleh...
3. Cross-over SPORTS game
See, if this was a cross-over adventure game where Mario and Sonic team up to get seven Chaos Stars then I guess thats fine. But where Mario and Sonic fight just to win the 2008 olympic games then thats just plain stupid.
4. They didn't even bother...
Getting new artwork for Luigi, Waluigi, Wario and all those other Mario guys. They just used artwork from past Mario games and just decided to make it artwork for the Olympic Games. Mario, Peach and Daisy were the only ones who got new artwork because Mario needed a picture to go on the cover that was new, and Peach and Daisy because Sega couldn't find artwork for Peach and Daisy in their sports attire where they weren't holding a golf club or baseball bat or something. Sonic artwork however, is a bunch of NEW Sonic artwork. Come on Sega-we know you hate Mario but give us more than that!
5. It sucks
I've heard from a few people who played it that it's not a very good game. Hmm!! Awesome.
Are you geting Mario & Sonic at the Olympic Games? I hope you say no. And if you say yes, it's probably just because you're a total Sonic fan who has every Sonic game there is. Or it's just because you're a Mario fan who wants to tell us how bad it is.
And the Mario Party series. I consider the Mario Party series part of the Mario Sports series. Don't ask why....but I do. The Mario Party series was VERY fun at first. Mario Party 1, and 3 were so fun! Mario Party 4 wasn't as fun, Mario Party 5 took away a lot of fun (Donkey Kong) and put in a lot of hate (Koopakid). Mario Party 6 was just like Mario Party 6, and Mario Party 7 just took away Koopakid and put in Dry Bones and Birdo. Mario Party 8 then put in two minor characters: Hammer Bro. and Blooper.
The Mario Party series also introduced the Koopakids/Baby Bowsers-stupid replacements of the sweet, awesome Koopalings. The Koopakids even got to be playable in Party 5 and 6! Luckily, they were taken out of the playable characters list in Mario Party 7 and were taken out of the series in Party 8. But whats worse of all is that they are confusing. People confuse these idiots for Bowser's sons. Some people call these idiots Bowser Jr. And some people think Baby Bowser (the real one) is a Koopakid. The Koopakids just confused everyone!
The Mario Kart series is actually fun! It's the only Mario sport game that I actually like. But I do have to say that they are releasing too much Mario Kart games. Mario Kart DS was released, them Mario Kart Arcade GP came, then came Mario Kart Arcade GP 2 and then Mario Kart Wii was announced. I suggest that you guys release a Mario Kart game every four years. 
So what am I trying to say? This: "STOP MAKING MARIO SPORTS GAMES!!!!!!!!!!" and that counts with Mario Party games.
