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The first example I had of this was in vanguard. The way the horse quest was initially timed I simply couldnt manage it. I always failed. Most other people did not have a problem but here I was after literally trying it 50 times still unable to qualify for a mount.
With the trend towards more twitchy elements in games, I expect to see this a lot more. There was recently a quest in tera that I gave up on. It was the final quest in the argon war storyline. Thankfully I do not need the reward but that quest will stare me in the face in perpetuity.
Now fail quests arent necessarily bad if they do not provide a reward that you really cant get otherwise or do not stand in the way of other quests in a long quest line. If you can't manage to do the twitchy part in part 2 of a 12 part quest then you do not qualify ever for the dungeon at the end -- well then there is a major problem.
There was one quest in asheron's call where I seriously considered giving out my account information so it could be completed for me after failing about 5 times and having the rest of the people give up on me being there and the last person who couldnt do it.
At any rate, twitchy quests like a mount obstacle course should get easier with every fail past the 3rd fail. If the time needed to get the mount is 1:50 then on the 4th try it should be 1:51, and on the 10th try say 2:00.
Some other quests if it notices you failed them enough times should give you a bye option if it is in a quest chain.
I feel this will become more and more an issue as gamers get older and older.