First, this is next to useless from a consumer perspective. Because anyone whose actually tested a single provider can tell you speeds vary by geography. Time Warner might be middle of the pack overall but the fastest in your particular area.
Second, they're really p#ss#ng off the ISPs here. If you want faster bandwidth out of the ISPs its better to privately talk to them than publicly embarrass them.
Finally this reinforces the reputation Netflix is already getting among content producers which is the company doesn't play well with others. There's a reason why the head of HBO and Time Warner are taking hard lines against Netflix.
Bottom line: Netflix is part of a content delivering ecosystem. If they offend every other part of that ecosystem it will be much harder for them to survive in the future