It's a matter of scale and theme, personally. I didn't want choose between Halo and Call of Duty, I wanted Halo Wars . Putting out another infantry-scale combat game, regardless of the precise differences, feels redundant to me. I wanted the game to complete the X-Wing / Armada parity so I could play out battles that decided the fates of planets. I didn't want effort and time being put into something that covers the same scope.
But that's my opinion, obviously. FFG felt it was better to push out this game at almost the same scale to compete with and maybe kill 40K. I understand that.
The fact that so many are still posting about their disappointment, though, means there's clearly a demand for this kind of game that Legion does not satisfy. I am hopeful that someday we can play with Imperial Armor using miniatures, not cards or our imagination (Out of the LCG/Destiny/The RPG series). Until such a game is announced, I'm going to remain disappointed that Legion did not fill this niche, and support others when they voice disappointment.
I wish we could turn this into something constructive, but the only way I see being able to do that is to launch a community project to design our own game. Going down that route is going to be like herding cats though- because everyone's going to have their own ideas, insist that they get implemented, and it'll language unless someone steps up independently and puts forth the effort. It could be me... if I had the brainspace. I know I asked Mel to make a T-16 skyhopper for such a project and I plan to collect someday.