I'm not thinking too hard about it at two in the morning, but maybe if it simply reflected one, single shot, back at the nearest enemy champ, that would make it more worthwhile. For instance, if you turret-dive, it would surprise an enemy champ not expecting it. You'd have to run afterward and maybe even take a hit from the same turret before you could get away, but that's a decent enough trade-off.
Alternately, while it goes against the title, flip its effect around to make it defensive. Make it so it can target a nearby tower, kind of like Janna's ability, to shield it or reduce damage done, or perhaps boost its attack speed and/or damage for a few seconds.
I almost never see anyone get it, and I've tried using it because I'll try anything just to see how it goes (double junglers, clairvoyance, and Support Irelia ftw), but even I can't find a particularly good use for it. It's never going to win games, is all. Given its price, would you rather have that, or, well, anything else around the same range that people typically get, for any role? Yeah, it's like that.
I'd rather it be a defensive item. By the time it's a feasible item, you already have enough offense without it. Invert its effect, in a sense, and it might be useful for a support item.