Hit it again tonight, after not playing it for most of a year, and had the same reaction.
Beyond flat-out not finding it plausible, I don't play games that force you into impossible situations. Indians defending teepees against tanks is not an interesting game. I want to believe that deaths come from bad tactics, not impossible death traps you cannot avoid. The game tries to force you into invading a full, undamaged battleship, and I don't want to. Seems lame.
Just not for me, I guess. I thought it was brilliant when it came out 30 years ago (-ish), and I'm sure it was, in context. There are still things I like about it, but I'm fundamentally not a fan of games that railroad your tactical options.