Forgot all about this.
I seem to recall more plots from season 1 than I do from seasons 2 and 3, and since I binged each when they first released, I don't think that speaks well to the memorability of the last two seasons. I did enjoy the finale of 3 though when they were all in the lake.
I'm gonna go ahead and give 4 a try to see if it picks back up for me. Hopefully Piper gets written out of the show or doesn't get a main plot line.