Interesting the results.
My favorite role is mid and that's because I enjoy the playstyle of mage's using abilities to do cool and varied things, this also leads to mid having a lot of counterplay and abilities to come back from a losing lane.
Top lane is the lane I dread the most because right now it's 100% snowball and 0 counterplay. If the enemy is stronger than me (aka their right clicks are stronger than mine) they just simply win and I just can't stand that these days.
I can understand why people don't like ADC, it doesn't feel very rewarding unless you're super ahead. you're supremely squishy and until you get a bunch of items you feel like you do 0 damage. Riot has indicated that ADC has a problem between the power they bring (a lot) and the satisfaction they have (not much). I just know the enemy always seems to do more damage than me in ADC and I don't know why. :S
I've gone from playing Mid, Top, ADC in S3 to Mid, Jungle and a little ADC and Support since the S4 changes. So my flexibility has actually gone backwards this season given I refuse to Top now, my ADC just gets worse and worse so I avoid it if possible and i'm still trying to find my feet with Support with the only Support champ I really enjoy being Nami (I want to like Janna but in lane she feels worthless). My previous most hated role, Jungle, is actually fairly entertaining now with the S4 changes though so far I only play Nautilus and Hecarim as most other i've tried (Maokai, Zac) felt weak (used to do Evelyn but after the nerf I refuse to do tank Evelyn, she's an Assassin, not a tank).