I don't have a problem with blinds and silences being in the game

They just last TOO FREAKING LONG.

Some champions have silence done well. Soraka has a nice silence which feels good for both players. Blitz has a nice short silence I've never complained about, and if it causes someone to die because of it then I applaud that use of silence.

And then you have this guy. At max rank, a 3 second silence. That's ridiculous. Lasts as long as a Morgana snare, yet can affect an entire team and is honestly easier to land (imo).

Or you can look at with a 2.5 second silence. Although Cho has plenty of weaknesses, getting hit by that silence is not fun at all.

Let's go look at blinds.

Quinn has a 1.5 second blind. At 2.5 attack speed, that means she can block 3 autoattacks. At max. Most of the time she'll block 2 autoattacks.

And then there's Satan. 2.5 second blind at max rank means that against 2.5 attack speed he'll block 6 autoattacks. That's a little ridiculous, no?

Tl;dr Don't make silences and blinds last longer than 1.5 seconds, it's not fun to deal with.