Piccolo Laser, strong or weak? I'd say neither, it's versitile! the eye laser is the most effective quick long range attack. It's instantenous, has laser point (hee hee) accuracy, and you can move while using it. Not only that, the slow but steady damage can go unnoticed by your oppent (unless you're in a duel). It's absolutly perfect for disc spammers cause you can dodge the disc and keep hitting them from a distance.
Does this make it too powerful? No. Once noticed or attacked by a non disc user, a potential spammer will have to give up. The target could move behind a mountain, or come up close and start attacking with rapid shot or more powerful beams.
In conclusion the eye laser is very useful, however, it can easily be countered, so it should not be condemned as being too powerful.