Yes, I stayed away from led turn signals for the same reason, they are just for looks, cant see them worth sh!t. Stick to bulb ones, mine are really small but are so bright you almost cant look at them directly in the dusk.
The problem with led signals is that they either use low power leds, leds with really narrow beam, or both. I'm in in the process of making my own led turns, the ways they are supposed to be. They'll be no more than half an inch thick with an almost 180 field of view and even brighter than my bulb ones.