I've had PS+ for nearly 2 years now (I got my PS4 just yesterday), and I've played many cool games for free with PS+ (Vanquish, Spec Ops the Line, Mass Effect 3, Assassin's Creed III, Tomb Raider, Borderlands 2, among others).
I subscribed because of the numerous games offered and also for the possibility to save my games on the cloud...
I'm currently downloading Resogun, Outlast and Trine 2 for my brand new PS4 (I "purchased" these games when they were offered for free in the last months, as I knew I would get a PS4 sooner or later). Not bad, I only bought Destiny and I already have 3 more games waiting for me...
Until now, paying a PS+ subscription has been worth the money. I hope this will continue even though now PS+ is mandatory to play on-line on PS4.
Note that if you're on PS3, you do not need PS+ to play Destiny.
Anyway, I understand your opinion. Paying for on-line play is totally unfair. And I was among the first people to raise against this fact when Sony announced that PS+ would become mandatory for on-line playing on PS4...