I don't mind when my thighs get big - as long as it's muscle. The only downside is that it can be hard to find long pants that properly fit when you have big thighs and a smallish waist - unless you want the pants to look baggy.

However, because i am a road cyclist and more endurance, my thighs don't get as big as some girls. Check out any track sprinter - they get really big thighs, but for them its an asset - they wouldn't have their great sprinting abilities without them.