So? SF's hardcore base has shit taste, we know this. Urien was fairly low ranked as well, with even Blanka being rated higher. How is that indicative of a character's quality? The people who do these polls aren't even the mainstream audience, so it's not really indicative of overall popularity either. The internet will just vote up cool guys and cute school girls, but a roster full of them would be empty and dull.
Laura would probably be rated highly on an online poll, but what has she brought to the SF series? There isn't a single original thing about her character, and absolutely nothing she adds to the franchise that other characters don't provide. Meanwhile
F.A.N.G is arguably one of the greatest characters to be added to a fighting game franchise in the last decade, but he'd surely rank lower than Laura would in a popularity poll. A character as a original as F.A.N.G, with a backstory that reveals actual depth, losing to a nothing character like Laura says all that would need to be said about popularity polls.