I haven't played it myself, though it seems to be a very popular and well-received game based on everybody on the net talking about it. At first I only knew it as the game someone flipped out about because Tracer was supposedly sexualized in a way that is beyond the range of decency and acceptability, but I find that claim to be silly on its face.
That being said, a friend of mine (who is much more a gamer than I, almost to the point of being a recluse because of it) has played Overwatch, said it is very good, and recommended that I get it. In his own words "You liked TF2, so you'll like this even more!" Which is not an uncommon perception of the game in question.
I'm still on the fence though, largely because my internet connection is a wifi system which, at the best of times, can stream Netflix films without trouble, but which is not conducive to playing online matches in games like Overwatch.