During the first editions of both games, the DW cards could have much more impact on the course of a game than the cards in FA could. This led to many players simply refusing to use TAC cards in their games, as it made an already heavily luck-based system feel even more so. Cards like the "Activate Two Squadrons in a Row!" card (Tally Ho) and the "My ship is now all fixed!" card (Pass the Tools) seem to have been two of the biggest offenders from what I've seen. Given the draw mechanic, where you always had a hand and could discard/redraw at will led to cards such as these being used quite often in a game.
The cards in DW 2.0 are roughly the same in their effects, although the whole system has been tamped down by eliminating the draw mechanic (you now only have a fixed number of cards to play) and by making it so that the more powerful cards give victory points to your opponent.
What I find most interesting is the built-in deck building "mini-game" that the DW 2.0 rules have. When and if Spartan ever gets around to releasing faction-specific decks like they are promising to do, this could be a very interesting aspect to the game.