They're trash yes.
I don't remember friends/elves sets having more stickers than usual.
While I haven't watched the shows, elves looks to be more than that at least.
Regardless of the story the sets are actually really nice, minidolls aside.
The only series I think should end is ninjago, because it's run out of ideas, I wouldn't mind if they brought it back later but I'd like a break.
As for series I'd like back, exo-force or atleast a spiritual successor mech line, or another Mars line, I was never a huge fan of space police, but something about the Mars lines caught my attention.