I think the "letdown" many people are expressing is that these other extras were really hyped up and expected to be revolutionary, but IMO deleted scenes and bloopers are a routine (even expected) addition to most DVD/Bluray releases.
For crying out loud! Absolutely no-one implied that the extras would be revolutionary. If anyone is disappointed with these extra features they're just bloody ingrates IMO. For one we get deleted scenes, pretty much a first for Trek shows, if you disregard Ent. We're getting a totally remastered EXTENDED frigging version of Measure of a Man and audio commentaries. And let's not forget that all episodes have been remastered from 35 mm. What the hell more do you want?