You can't watch this film and not think of one of the two films I referred to- 2003's "Something's Gotta Give" and of course the Oscar- winning 1997 "As Good As It Gets". Overall, I'll give "And So It Goes" a modest recommendation if you liked those two films, but this movie has got it's problems. One of those problems I think honestly is the length- at only 90 minutes (your standard running time to maximize the movie multiplexes' number of showtimes), you just don't have the time to fully develop the story and characters; unlike "As Good As It Gets" for instance- a 2 & 1/2 hour movie. Oscar winners Diane Keaton & Michael Douglas I think work well together, and have on-screen chemistry. They just needed a more fully-developed screenplay.
And Rob Reiner (who also has a supporting role in the film)- wow; this guy used to be one of the top Hollywood filmmakers of the '80s and early '90s- with films like "Princess Bride", "Stand By Me", "When Harry Met Sally", "Misery", "A Few Good Men", etc... He had a modest comeback with the 2000's film "Bucket List", but other than that, the guy can't seem to catch a break about the past 20 years- ever since that infamous bomb "North" I'd say?? Well, anyhoo, if you're looking for something to watch, and the aforementioned films are not readily available (or you've seen them enough already), you may wanna give this a try- And so it goes...