There isn't really a "second one". Overwatch 2 was just a patch with essentially two major changes. They changed the monetisation, making the game free-to-play and introducing the battle pass. An especially unpopular part of that is that new heroes now have to be bought with real money or unlocked through the battle pass. The other big change is the move from 6v6 to 5v5, which was controversial. There are definitely some positives, like getting rid of the "double shield meta", which did make the game more fun. But there's also more pressure and focus on the single tank.

The game is free and if you bought OW1 you still have all your stuff (cosmetics and all the non-OW2 heroes), so if you're curious you can just check it out. Personally I'm still enjoying the game but there's also a lot of valid criticism.

Idk if it's "bad," exactly, but I don't like it. I liked the meta for the first game way more, I miss the old 6v6 team structure, I don't like the changes made to my favorite characters, and the monetization is really sucky. It felt to me like they took everything that was wrong with the first game, kept it as is, and then took a bunch of the good stuff and made it worse. lol

But that's just my opinion, I know there are def people that like it. I only wish they'd release "Overwatch Classic" or something so that people who prefer OW1 can still play it--ideally with the lootboxes removed and a way to unlock character skins and stuff by playing those characters and progressing, but I'd honestly take just like a snapshot of the last stable release before the OW2 update. It was one of my favorite games and I just really don't like the OW2 updates. 😥