What it boils down to, I suppose, is that this is perfectly fair and accurate review. Consider, is the reviewer actually saying anything that we didn't already know? Freespace and its kin were famous for their vast plethora of controls, some even blamed that as part of the reason that Space-combat sims faltered as a genre, and the Multiplayer is still in Beta, this site makes no secret of that fact.
All in all Diaspora gets very positive comments for presentation, atmosphere and story, and justifiably so, there are still weak spots, the developers would be the first to agree with that, and this review identifies the weak along with the strong, it wouldn't be a very good review if it didn't.
All in all, I think both the Diaspora AND the SCP teams should be incredibly proud of that review, you got a rating that wouldn't be insulting to a moderate commercial release based on work done on an entirely voluntary basis and purely out of affection for a ten-year old game engine and the BSG Universe. To see the SCP Engine not only throw down the gauntlet to more modern games, but actually have its visual quality commented on is a far more incredible achievement than I think many people realise.