as a rule I shy away from season passes. games lose favor so quickly you can sometimes double the price of the game for fractional return on time spent playing. By the time DLC starts rolling out there's another FPS going that's grabbed attention.
the last additional content I can really say I bought and was worth it was the add on maps for halo 2. I spent a ton of time playing halo 2, well into when the 260 first came out and beyond. after that I've always been disappointed. After boarderlands 2 I was done with DLC - heck, if you skip the game altogether at some point an ultimate edition will come out with everything for free or less than... Horizon Zero Dawn just was on sale somewhere for 10 with everything.