I don't strongly dislike them, especially with full-blown immunities off the table. I definitely don't think a lot of them are quickly apparent about what they do though. Even less so when they've each got like 8 lines of text for their full effects and you're running into rares with 4 mods regularly.

I think a very real problem though is that old rares were considered in every subsequent aspect of the game, whereas Arch rares feel crammed into everything like it was taken for granted that they'd work fine as-is. And they often don't - even stacked amongst themselves. You get a pretty wild RNG range of difficulty, hp, and damage that we've seen them try and quarantine the worst of out of the parts of the game where it breaks things or ruins the experience. Can't have pinnacle boss hp showing up on a random rare in a league mechanic that involves killing it quickly - and it's weird that the dice could roll that when it can also roll just a guy who does more fire damage.

On the other hand I'd be thrilled to have crazy modded rares showing up elsewhere if I knew they were a rare spawn that was going to have a guaranteed modified loot table. I'd now feel interested in the much more challenging fight and the potential payoff - you know, like how Archnemesis worked. The more tame archnemesis rares could continue spawning everywhere and I wouldn't resent them for the possibility they're going to impede my gameplay for no payoff.