I figure this might be general feedback, but it applies to the beta as well, since it really struck me as absurde watching starbase assualts:
The ships just SIT THERE and fire / take a pounding. There is no evasion, no indication that the ships are anything but chesspieces or componeents of a formal line (should at least be a wall) of battle.
I don't know how many people here have played the Point Defense systems mod for Homeworld 2, but that team managed to take fleet battles that were very set-piece like Sins is right now and transform combat into dynamic engagements where even BCs, CAs & CVs engaged in combat maneuvers for position.
Not only does it make battles far more interesting to watch, it allows for more opportunities for effective fleet command to turn the tide of a battle.
Does something like this belong in Sins? Is it even possible to implement with this game engine? I think that if the answer to both those question is yes, this game could gain some much-needed flair that would set it on the next level of space RTS glory. Space is 3D, so there's no need for ships to stay locked in one spot and in one plane during battle. It certainly doesn't say much for the imagination of our ship captains.
Some youtube links to illustrate what I'm talking about:
http://www.youtube.com/watch?v=OXTQrtq-Da8&feature=related
http://www.youtube.com/watch?v=MGURvEQxAs4