Well, regarding rushes(which I assume you mean zergling rush) as a protoss player, defending can be done with building positioning and zealot + probe formation, also build order on getting zealot out fast.

When Zerg goes zergling rush, his putting a lot at gamble, if you manage to defend without lossing much probes, he will be in much trouble later on if he can't make up to it later on.

With much more grouping control and less manual button pushing, I prefer SC2 than SC:BW.