Played on and off before but never seriously. Was wondering if it would be worth resubbing

That really depend on how tolerant you are of doing same thing over and over again. You can experience this entire expansion is less than two months.

I would recommend give it a shot. If youre a casual WoW player then there are enough content to keep you going for a bit.

No, the game is shit.

not worth playing if you don't already love it

Wait till Legion

Yes