Ranked is competitive > fun.
If you don't care about winning just play normals but in ranked that is the point winning so loss of enjoyment is understandable at the expense of winning. Me feeding my laner isn't fun but if my team carries me in ranked it is all ok because that is the point. I don't like support but I can play it very well and if it is what I HAVE to play because of the fact that there isn't enough variability in roles being queued up (because that is why autofill happens, so you can play games rather than wait in queue even longer than you already do) then I will.