About DLC, I admit it is daunting to look at that stack of DLC or to look at how much I have spent per hour of return (so far). That said:
Their DLC model is quite generous. As long as you don’t want to play AS something, you get the DLC for free. New stuff just gets put into the game as enemies. That is pretty nice. There is a lot of entertainment to be had off of a single purchase and that just keeps growing. (Notable exception= TW:W1 for ME campaign)
The DLC release pacing and cost, is actually fairly trivial for the amount of entertainment return per dollar if someone is going to play the as new faction in a given DLC. If someone is not going to play as the new faction, then don’t buy it and see point #1 above. (Notable exception= faction roster expansion, but if you like a faction, just spend the $9 for more of that faction).