I really enjoy the artstyle and how each class performs with eachother, going alone is a death sentence in this game as Zenyatta will slap on a orb of discord and then any class can take you down in a few seconds.
In what I've seen for this game though, people call it a TF2 clone because it has classes and the medic has a 'med-gun' but just slapping on the term TF2 clone or even TF2 based game is not really a fair statement to make on Overwatch, at least in my opinion as that game has essentially killed itself over the past couple of years and updates, its comsetics over gameplay now and you can't play on a server without everyone doing a conga line, then getting yelled at because you wanted to play like intended.