Should I get Pathfinder?

[Leon]

That's why. Who needs a fighter when an extra cleric can fill the same role not quite as well, but with a ton of healg and the ability to summon more meatshields? Yet a caster is absolutely vital.

If you don't have a caster (which is completely possible) then you will find other ways around a problem than a over reliance on magic to solve everything.
Even if you have another cleric in the group its still a better group that is Supported by the classes than can do so rather than have them be solo paragons.

Really who needs to play anything.... all classes are valid choices for anyone to play.