Ive only had the PS4 since late November but have been pretty happy with the PS+ games so far - i loved Walking Dead 2 (I hadn't played 1 so had to do them in reverse but was still very impressed), Gauntlet was great and i played it all the way through, I am currently playing Grim Fandango as have never bothered with PC games so missed it all those years ago.
The online side of PS+ is a no-go for me, i got Star Wars Battlefront but can't be bothered trying to play against people who obviously do nothing but play all day every day, very disappointing, so won't bother with that again, but overall it has been a positive experience so far, I got the code for just over £32 so it wasn't too bad.
I wish there were better discounts for PS+ though, as i was new to PS4 i got the PS+ linked to me UK account, wish i had done it on my Canadian account now, will probably do that next year.