I like the 86 platform only after it has been modded - including the stupid "Rocket Bunny" kit even though it is played out. Yes that vehicle is underpowered but how many of us have been in a car we considered over-powered?
Like the z34 I think the 86 is a great platform for starting a build - although there isn't any sense in comparing stock Z to FRS/BRZ (apples to oranges) Like anything else you can build a very potent FRS/BRZ if you are willing to invest the time and money to do so. Here is link to 400-500 hp BRZ
Nearly 500-HP Turbo Subaru BRZ Tested on New Ignition
certainly nothing to scoff at for a light weight car that starts around 25-30k
Like everyone else here I am happy with my zed as it was the best fit for me.