I've had 2 Hobie 16s and lotsa' monohulls from 20' to 41'. The 16 is a classic, the ultimate beach boat. If you have warm water there's nothing to beat the Hobie. I think performance got in the way of parctical fun in later boats. The smaller Hobie was it 14' was too small and tended to drive unde with two people. The bananna shaped '16 hulls was a way to keep the lenght down and help from driving the bow under. Later boats used longer hulls to get more flotation forward.
Is it the best wat to learn to sail? Well certianly for a caramaran. But you can always sail a monohull. The difference with a cat is that it acellerates so that there's a big difference between apparent wind and actual wind. Not so for displacement monohulls. Simply you sail a cat differently. But I say go for it. There's nothing like a Hobie on a summer day.