I love my disc brakes. We have some trails with creeks so I am never worried about stopping after having a muddy or wet encounter with a trail. V-brakes wont respond that way. If they are wet or have debris it can compromise their stopping power until they are dry or cleared. Also, rumor has it V-brakes destroy rims but I have never seen it happen.
V-brakes are nice, but I love my disc brakes. I prefer my disc brakes. I FEEL I can regulate the stopping pressure better than with my old V-brakes and to me, they feel more smooth.
They do take some more TLC though. It seems I am always adjusting them before I ride, just an extra 5-10 mins though, no biggie.