I think Flash is a good and vital summoner spell for many champions. A metagame without flash gives blink champions an annoying advantage. Flash should just be changed to be like blink dagger. Can't use it within two seconds of being hit, reduce the cooldown on it to around 180-210 seconds (depending on mastery specs) and increase the range to 500.
The constant flash nerfs are annoying me because I play Alistar and he needs flash. Initiating with flash is not annoying, it's just good gameplay. However, escaping with it is kind of annoying which is why there is so much qq about it.