What's good:
"The weight of time" documentary - What makes this documentary somewhat unique, is that it allows the screenwriter some screen time to convey what his vision of the movie would have been. It's a gutsy move that Ramis allowed this on his film, since the original concept of Groundhog Day was far darker than the final product. It's an interesting watch, although it would have been nicer if Bill Murray made an appearance in the documentary.
Director's commentary: Ramis' approach is to tell small anecdotes about minor characters, how people were cast, how the scenes were filmed, etc. It's interesting and entertaining in its own right. He doesn't just drone on and on like many directors do. I think his acting and comedy background helps make him be more interesting, personable, and accessable for viewers to listen to.

What's lousy:
I'm probably alone on this, but the animated menus are annoying, silly, and slow. You have to wait for the animation to get going before you're allowed to make your choice. It'd be forgivable if there were any easter eggs hidden, but I know of none. So, it's just annoying.

The very simple story is one where Bill Murray plays a self-consumed, hyper-cynical, and arrogant weatherman with a mean streak who finds himself paying out some sort of karmic debt by having to live through the same day (Groundhog Day) again, and again, and again, and....

The phenomenon strikes him with terror (few play "overwhelmed" better than Murray) at first, which is very funny material, but it's when he becomes accustomed to his seeming immortality and liberty from consequence that things really get unbearably funny.

This movie is fantastic in that it can be watched casually, as it's chock full of slapstick style entertainment (no offense to Bill Murray, but just looking at his face makes me laugh, great expressions...); but what really endeared this movie to me was the lesson I think is wrapped up in all the humor. I think the movie is about "appreciation". Appreciation for the value of every days potential (I know that sounds cheesy), appreciation for those around you that so easily fall into the background from all the noise of our environment, but most of all, appreciation for the difference between doing the right thing and the wrong thing. This movie smartly creates a "clean A/B lab". In the first lab, you have a bunch of failed attempts to create the perfect day. And finally, all those attempts are contrasted against the control group...a perfectly lived day, one where all the latent opportunities we don't even see are exploited...

And what a difference a day can make.

I hope you enjoy as much as I did...