95% of all cars that are driven on the roads, at least over here, seem to have a maximum of two people on board.
In that regard, a two seater should do just fine, and I also prefer a two seater, versus a 4.
However, whilst it is occasionally cool to have more seats to haul friends around with, it kinda boils down to the same discussion we had a while ago on owning a truck/SUV capable of hauling stuff in bulk. In that particular thread, I mentioned that I really ever only need a car like that once or twice a year when I need to bring some new furniture from the shop, back to my place. But instead of actually having bought a vehicle capable of doing it, I just pay a few extra bucks to the shop and they deliver it for me. Much less hassle
Of course, there are those who really do need the space, be it to transport goods, or people, but in reality, I think it's a load of bollocks.
Only if I had a family, would I seriously consider getting a 4 seater (currently, I don't have any kids, and won't be getting them for another few years... hopefully

). With my GF, we do just fine having two cars, both of which are two seaters.
And if I had to get a 4 seater... well, I can afford to get a second or third car, so might as well get a simple 4 seater, so that I can keep my more sporty 2 seater
I see it like this:
80% of the time, I'm alone in a car.
19% of the time, I'm with someone else.
1% of the time, I could do with an extra seat or two, but luckily there's taxis, friends cars, parents cars, etc...
For that one remaining percent, I don't consider it enough justification to purchase a 4 seater over a 2 seater. That's my opinion on the subject