Mate, all you have to do is browse the catalog of PlayStation 4 games out there (after 2 years there's already a shit-ton), tally the ones you like and figure out how badly you want/need them in order to buy the PS4
Games are your differentiator. Uncharted? Bloodborne? Infamous? Disgaea? Killzone? Gran Turismo? etc. etc. There are plenty of solid games out already, it just comes down to how much you're willing to spend.
Plus, the bunch of games coming out in the next few years, but if you're talking about a current purchase, you're looking at the games coming out at least this year and before that.
If you're looking at multiplayer there's already plenty people here who are
in on it, so