Yep, I leveled up an alt and was trying to do some lower keys in the +5 range and every single one fell apart. Even with me coaching on mechanics and pulls. Maybe the groups I were in were the exception, maybe not. What I can tell you is the dungeons in BfA are significantly less forgiving than in Legion.
In Legion I would Pug 10’s all day. It was actually fun. If none of my buddies were around or I was home sick for the day I would just farm 10’s on my toon. Did runs fall apart? Of course, on occasion. But nothing like the rate they do in BfA.
In my opinion, a change should be reverted to move tyran/fort back to +10, and bump the seasonal affix +5 levels above that, and have it offer a small extra reward, like +5 or +10 ilvls on gear. So they would now drop +375 or 380 base, or something like that.
This would make lower keys much more forgiving, make 10’s less daunting for all the people that aren’t into pushing keys, and give incentive to those that want to push, and rewarding them for doing so.
Right now it’s just backwards, there’s a ton of over-engineered trash, affixes that start at +2, and it’s just pushing people away.
Also, it would be great if there was a way to re-roll keys. It was so refreshing to at the start of the expansion. Say you got a group together and someone had a high key, but you didn’t do a high key last week because you were out of town for most of the week so you only got a +10 done. So now you do a +14 with your buddies and and the keys turns into a dead key, and everyone else’s keys are for dungeons with bad affix combo’s. Well, your key is so low that you now need to spend 30+ mins trying to bump the key up to the level where it’s challenging. That’s stupid, especially considering we all don’t have a lot of time to play. And I know when I have an hour two to play I don’t want to spend 2/3rds of it bumping my key up, so instead I just go play something else.
I can’t tell you how many times I’ve heard my friends/guildies say, well dead key this week, I’m going to go play something else. Laters…
On the flipside, how it was before was great. Jump in, get into a group with your buddies, and be able to re-roll/bump up your key after putting in the effort to complete a higher dungeon… I still think this change was terrible for the player experience. Especially considering some dungeons are just daunting, unfun, and over tuned (looking at you, King’s Rest…cringe).