As to quality assessment, I think the "IMO" is implied, but you'll find plenty of critical opinions and review aggregators that support BSG.
More generally, aggregator/critic ratings at best only tells me whether something is really really horrible. Higher aggregator/critic ratings don't necessarily tell me that something is "good".
In the case of really really horrible stuff, aggregator/critic ratings don't tell me whether something fits into the "it's so bad that it's good" category.
