Guild Wars is the only game made by an "ex-Blizzard" staffed studio that I feel has had any significant amount of success. Just goes to show how much these things are collaborative efforts that rely on a particular environment to come together.
He's kind of a one-man army, but his influence definitely has shaped the more popular games and industry landscape today.
[0]: https://www.riotgames.com/en/who-we-are/riot-games-leadershi...
GW2 was easily my personal biggest let-down in gaming of all time. They eliminated GW1's namesake PVP mode and the entirety of its super-deep build and combat system.
So I can see why they went down the route they did. I agree it's a bit of a shame though. Would kill for a GW1 re-release with some updated graphics and QoL improvements.
Maybe it made sense for them in order to reach a bigger audience and maybe it paid off for them. I just wish they hadn't gone the "true MMO" route.