Samurai is cool. Paladins is ok especially at 70 where you can actually build it pretty fast. I do think intervention should be a 10 second thing though not 6. Seems tricky to time with a few abilities. Do it to early on a boss cast and the effect drops off before the hit. Do it to late and the damage is already calculated.

Scholars could be better if it worked slightly different. Have every embrace cast build the gauge and also use the gauge for fey wind, whispering dawn etc etc. With some duration tweaks. 100 gauge might be 60 seconds of fey wind or dawn where 50 guage might only be 30 seconds.

I like the ninja guages. I only hate ten chi jin and it's incredible lagginess.

Oh and in general for a lot of jobs keep the guages on death.
Especially scholar where it takes so long to build the thing up in the first place