We've heard from both sides on the legendary system, both for and against. Personally, I'm in the middle. As a player, it's been a point of frustration, especially when I get the stat stick ones. On the other hand, for the game as a whole, I view it as a "necessary evil", for a lack of a better term. It's what's getting people to do their emissary quest every day, or run mythic plus when they're satisfied with their current trait level. It's the main thing getting people to do stuff like normal and heroic en when they're 880+. All they needed is some sort of incentive at all. On the other hand, it's quite possible that players will fatigue of doing Maw of Souls carries for the 500th time. Everybody has their limits with this sort of thing, so one can hope we'll continue to get diverse streams of content. That's my view on it anyway, it's getting guildies logging in, and me playing the game everyday, but I'm obviously not super happy about the repetition nor the RNG of it all (would have been nice to target legendaries). It's a carrot on a stick of sorts, but the game's probably better for it, but maybe not in the long run. Hard to say.
TLDR: Not exactly fun but the games probably better for it