For me, it's not the leg part of the bike shorts that I am selfconscious about, it's the way the chamois part lays in the buttocks area. If my butt in the shorts just looked like, my butt in the shorts - well I would be greatful for the spandex holding everything in a defined shape.
BUT (no pun intended) it's the diaper effect of the chamois in my most comfy shorts that I hate.