Not if you aren't interested in the games they give you or the games they discount. Just looking through the list of the games PS Plus offers you, im interested in a fraction of them. Most I already have or have played, the others, don't interest me.
I don't think its worth it, for me, to spend 50 bux a year, when im more than likely not going to take advantage of the PS Plus games or the discounts or play much online. The only thing I really play online at the moment is Battlefield and Titanfall, which I have for the X1. I didnt do much MP gaming on the PS3 and im assuming that'll be the case with my PS4.