OK, so I suppose it's no surprise. But after a couple of days of owning it, I am completely impressed with Halo 3. The first day I played through a good portion of campaign mode (on Normal...I'll surely try a harder level in the future). As suggested by the recent Wired Magazine article, it's clear that a great deal of time and effort went into making the levels very playable. While there are definitely places where I died several times trying to figure out how to get through, there weren't any times when I felt like it was too hard.
Tried multiplayer for the first time last night, taking advantage of the friends-only feature to ensure that I didn't end up getting trashed by a bunch of strangers. It's always less humiliating to get beat by friends or co-workers somehow, however weird that may sound.
I'm not going to get all crazy and call this the best video game ever, particularly since I haven't played the full BioShock yet, but it's a darn fine game. In a world of anemic or just plain lousy games, a sequel that plays this well, and looks this good, is a true rarity. And Halo 3 is more than good enough to stand on its own, even if it weren't the third in the installment.
And last, but not least, no gamer regret yet. Certainly not on this game.