The Reason why I bring up UI as being the key flaw in SE5 is that without an easy, intuitive interface, the overall playability of the game dies off rapidly. Atrocities touched upon most of the UI issues.
As for things like bugs, Aaron is directing his efforts onto that and the AI can be fixed by us --the we can form an angry mod and force Aaron to adopt it into the next patch.
Another issue I'll point out is something that SE5 inherited from Starfury is the lack of ease in developing new race styles for the game. If Aaron does an SE5 Gold, it must MUST have a ship-modeling program that exports to SE5.