In my opinion, except for the signature and Articles campaign, all other campaigns are a waste of time. Above that finding, a good bounty is not that easy as most of them are scams. What you can do is to join a bounty campaign that is being run by the below Bounty managers as they have a good reputation and a lot of experience in handling bounties on Bitcointalk.
Well, maybe each member has their own view regarding top bounty managers in this forum. But I can say that those bounty managers who handle some campaigns on the "services" section, has a better reputation than others. You can take a look at their ANN services or contact them directly. Here is the list of some top bounty managers in my opinion:
1. Hhampuz
2. yahoo62278
3. DarkStar_
4. Coolcryptovator
5. CryptopreneurBrainboss
6. Murat
7. roycilik
8. sujonali1819
9. Zwei
10. TalkStar
11. Etc