That's a pretty decent deal, actually.
Still, I think that if the service is so good, then it will sell itself without needing to gatekeep regarding online multiplayer.
PS+ is amazing. I've had it for quite some time and have another year of it paid for already. It is just that Sony doesn't really market it so a lot of people don't know much if at all anything about it.
Every person I know that I showed it too and explained it too was sold once they understood it.
They have what they call an instant game collection when you sign up for PS+. The games rotate out over time but in general get around a dozen or so games right away after signing up.
Each week or nearly every week you get a new game added. This month alone they are giving these games to PS+ members: Uncharted 3, XCom Enemy Unknown, Little Big Planet Karting, Deus Ex Human Revolution, Saints Row the Third, Machinarum, Virtues Last Reward, and Gods Eater (last 2 are Vita games). They give new games away too, a few weeks again Zombie Tycoon 2 came out and on its release day you received the PSN and Vita version for free as a PS+ member.
You get some serious value for your cash with it. The "catch" is you can only access those games that you get from PS+ as long as you are a PS+ member. Otherwise once a game comes out for free on the PS+ you just add it to your chart, check out with it (doesn't charge you since it is free) and it is locked on to your download list to download whenever you want. Also PS+ members get bigger discounts on sale items as well and those you keep forever regardless of PS+ membership.