Rom Coms are very low on my watchlist. That doesn't stop me from watching one when someone I'm a fan of is in one. In this case Kate Winslet.
This one is as good or bad as they come. They go through the paces checking all the boxes along the way. And at the end, naturally, comes the happy-end. A feel-good-movie. It is way to long, though. Seems like you could make a movie out of either one of the plots and be better of focusing on one instead of both characters.
I do have a problem pictureing Jack Black as a love interest. Probably not the best casting choice. The best moment in the movie was when Arthur entered the theater, which is in itself an indicator when you have a movie about to women finding love and happiness when they really trying to escape it.
Ultimately not awful and I always enjoy watching Kate. Like I said, not really my genre.