Railjack is amazing for farming credits/affinity, outside that I tend to not play it eventhough I love it because of the bug that causes doors to sometimes stay locked, it's frustrating when it happens and sucks all the fun out of it.
Also as Culaio said once your ship is fully geared the fun kinda dies out, when I played railjack for the first time with my friends or even random it was some tense action, everyone had to constantly be participating, on both turrets, at the laser, to the battleforge, going into enemy ships, now that I've got a fully maxed out ships all fighters can be clea