Mate... you are just a bad player ( edit - as in you lack the knolwedge/skill ) I read this whole thread and you and Aaaarg have one and only one issue which is your inability to counter Sigrid with what in your mind should def counter her.
1st of all rares are amazing when used well, there's many cases, beating Ancient Battle is hard for most, then you see a team of rares doing it. Rare doesn't mean trash, while at the same time Legendary clearly doesn't mean Op... there's, many leggos that are pure trash, Drizzt being one. Sorry you got him to 5th inspo, Devs did him wrong. I also got him. Sucks for you and for me. Guess what Questa is better lol
There's many tactics to beat Sigrid not just hero counters, but guess what that's for you to find, same as I did. I love Sigrids teams cuz I know they will feed me arena points. On other hand can't stand Durango, Premtsa, and many other leggos. They one shot whole teams at times. So broken... well yes till I found a way to beat them. You know... this is what this game is about. It's chess kinda and again... you just suck by the looks of it. Good thing is you can learn and people in this threat already gave many solutions which you continue to ignore.
Regarding everyone using it...well it's a great combo, that very easily any news can grab. Ifcit wasn't Sigrid it would be something else. All games have the f2p heroes/teams. People have nothing else that gives them a chance so yee they use their limited weapons. You on other hand want to win with your credit card. But the card doesn't select gear, or displays the heroes in the arenas. You do... so stop complaining, and realize that on champions arena barely anyone used Sigrid teams, cuz THAT'S A LOSING TEAM.