More choice isn't always better: why I dislike the new runes.
I'm going to keep this brief and use a small example. I like Ultimate Hat as a secondary tree rune. Lower cooldown ults are nice.
But there are so many movespeed options in the rune trees (which other people presumably take) that I am pretty much forced to take the movespeed rune instead. Because if I can't catch someone, then a lower cooldown ult isn't very useful. This basically limits ultimate hat (for myself) to global/long range skillshots only. I can't take it on anyone else, even if I want to.
I actually feel like the old runes had more variety. They were raw stats. Even if you took the "wrong*" or "not meta" stats in the old runes, you're not going to be punished as hard as you are in the new runes.
*Note: "wrong" means taking attack speed or something instead of AD. I'm not talking about taking AP on an ADC.
"Choice" is just an illusion in these new rune trees.