Congratulations on the offer! I don't currently work there, but from what I've heard, it's still pretty good. It may no longer measure up to the Google of yore, but I'd still look very favorably upon Google compared to the average working conditions for software developers today.

The folks who seem down on it have legitimate gripes (e.g. you're a cog in a large machine, management is intentionally sparse, hard to get promotions), but I think it really depends on what you want out of a job. If you want to be your own boss or expect to remain a big fish in whatever pond you're swimming in, Google's probably not going to work out for you.