im not sure if you understand what flash farm is
jungling as doom is forcing your team to play 4v5 for 15-20min
IF he gets good creep MAYBE he can gank IF he still have enough mana
and what after?
hes not really a pusher nor strong ganker like rest of the junglers
as for laning
imo he is not picked even after buffs because he lacks reliable stun and good aoe
old school tanky radiance carry is out of the question now and why would you choose doom if you can get maguns/sven ^^?