Terribly sluggish responses of units to mouse commands (slower than orders to air units in Warcfaft 2), extremely inconvenient interface controls, which are also impossible to rebind - you constantly scroll for kilometers with the mouse wheel. The game doesn't hold a candle to a similar space strategy/exploration game: Pax Imperia Eminent Domain (1997), which I've played through 7 times, playing it not only in the old days in 1999, but even in 2018.
2.0