Microsoft Xbox 360....  

The first one you wanna get is ofcourse
gears of war, its' one of the best.
Elder scrolls IV: oblivion, it's supposed to be awesome.
Also wait for assassin's creed, it's like mixture of prince of persia and hitman.
call of duty 3,
def jam:icon
halo 3 and tom clancy's rainbow six vegas, or ghost recon advanced warfighter 2.
i told you different kinds because i didn't know what genre you're into.
but these are the best and most popular ones, especially the first two.

That's a tough one because everyone has different tastes in games, but I have to admit that both my very small Sony PSP game library and my Mac game library have a couple of clunkers, games that seemed like they'd be fun based on the box description or a review online until I dropped the cash, played them a few times and got bored.

Fortunately, there's a really great Web site that consolidates the reviews of all the other game sites into one "meta-review" rating called, ingeniously enough, metacritic.com. It actually offers up reviews of movies, TV shows, games for a wide variety of different systems, books and more, but for us, let's focus on the Xbox 360, shall we?

The metacritic area for the Xbox 360 is here: Metacritic Xbox 360 Reviews. Look down the lower left corner of the page and you'll see a nice scorecard for all games they've analyzed, and the lower right will show you the top scoring games on the site.