Yeah, it's an AAA title (90+ on Metacritic), so it's definitely a great game, no wonder people are happy.
On the subject of AAA games, 360 desperately needs one this year as exclusive :
PS3 exclusives AAA full games in 2009 : 2 (Killzone 2 and MLB 09)
360 exclusive AAA full games in 2009 : 0
It seems 2009 was the year of the PS3, like 2008.