Take it from a guy, it's not a good look. It's an undergarment for a start, well leggings are and I don't see how making them blue and putting a "j" in the name changes that.
Mainly it's because you can see a girls arse in a retarded amount of detail, then she turns around and has a camel toe.
OP people don't say anything because either they're your friends and don't want to hurt you/have bad fashion sense or because they are complete strangers and that'd be slightly weird.
Also to the people with the "denim" leggings, not sure what you're on about but skinny jeans/jeans win every time. No joke.
I dont like the legging material Jeggins but i always wear the denim ones they are like jeans anyway but comfier. I always try skinny jeans on and they are ALWAYS too long or baggy in the legs like straight legged jeans. Even the super skinny ones are too baggy for my legs I can't get a size smaller either because then they dont fit my hips :s so annoying so denim jeggins it is.