One thing that really pisses me off about review sites is they only look at the numbers instead of the quality.
Not everyone encodes equally and some people are able to get much lower bit rates with better quality than those with higher bit rates, but they get poor review numbers because the bit rate isn't high. IMHO it shows just how clueless many reviewers really are to use such a method instead of looking at the actual video quality.
But to answer your question, you are WAY over killing it. But you have a choice, you can make better videos to make your members stream and download them faster or you can stroke the cocks of the review sites and possibly upset your members with insanely huge files.
Go read this guys blog. This guy is an encoding God. Look at what he can do with MP4 and check out some of his settings. It will blow your mind. You'll have better videos because of him, but the review sites will give you a lower score. Maybe tweak out your streams and offer 1 download video per scene that will allow for a good review score.
Read this guys blog like it's the bible:
http://sonnati.wordpress.com (Thank me later)