I enjoyed "40 year-old virgin", liked "Knocked up" a bit more, but I didn't like "Funny People"... knowing he was directing "This is 40", I was worried a bit, but as I recently saw, my reservations were alleviated by a great margin.
The movie feels like a nice reunion with old friends. Judd Apatow's movies usually feel like that (to me at least, save for Funny People, which outstayed its welcome) and so "This is 40" goes back to the "Knocked up" characters of Debbie and Pete, who are both hitting the 40s but can't quite get a handle on things just yet. Professionally and personally, things aren't truly great. Pete's record company is going down and Debbie's business gets a few troubles of her own. The movie follows the formula of all romantic comedies, but by the time the ending arrives, SOME things aren't as resolved as they would have usually been in less well done movies.
As far as special features go, Judd Apatow delivers quite a few interesting documentaries, interviews, deleted scenes and more, but we're still far from the two-disc Funny People that had just about everything AND the kitchen sink... and then some.
If, like me, you were disappointed by Apatow's Funny People (I almost talked about this one more than the actual reviewed movie, but Adam Sandler didn't help so there you have it), "This is 40" actually turns up a lot of sincere laughs and emotions. If Apatow continues this way, I'm sold.