This game has no agency.
You get feared, suppressed and taunted in a team fight by
, the fight is over.
In fact, I have never been on a team that won a fight when the enemy has those 2 champions. Ever.
By the time all the CC wears off, your team is dead. Its not fun to sit there with no control over your champion and watch your team lose. The coordination required by a team to bait those very strong team fight ults and team fight at the right time is spectacularly hard in Solo Que.
Perhaps this isn't a problem with teams that play together and communicate, but in Solo Que it is simply not fun.
Other not fun combos would be like

You get the idea.
All of this may not be as bad if the game wasn't set up in such a way that the worst player on the team has way too much ability to sink the entire team.
League could be a great game. The damage needs an across the board reduction, and CC duration need to be reduced across the board as well. The game would be more fun with more margin for counter play. So you and your team start a great team fight. Well ya know what, the doesn't mean you get to just win the fight. You should have to make consecutive good moves, not just CC an enemy team into obvliion which gives them not chance to counter play.
I swear, its like the clowns at Riot don't really understand anything about game design or game theory.
**If chess was like a League Match, you would have a 70% of losing the match if you lose the first pawn, an a 90% chance of losing if you lose the first real piece. No one would fucking play the game if it wasn't VERY possible to turn it around when behind by playing smarter or changing your tactics. **
Riot has no idea what they are doing, and it frustrates me that very few of you seem to realize this.