Which one? The game was rebalanced so many times it was basically several different games. If they put in a 2-2-2 mode with the weaker open-queue tanks, I'd call that close-enough to Overwatch 1. Of course, that still would mean the new expensive monetization model. Like there's one skin in the free tier of the current battle-pass, and it's for Torb.
When they made OW2, they replaced OW1 with it. Technically, I think OW2 is just a really big update for OW1. But now there's no way to play the old version that a lot of us liked better. :(