Depends what you want. I’ve found Bonus info tends to bring in short-term or one-off quick hit players…doesn’t work for me. If you want to look longer term, then honesty is the best policy IMO. Tell ’em the bad points as well as the good, let them compare the casinos while they are on your site, not after they’ve gone. If you tell someone a casino is all goodness and light, then it takes a week to get paid when they win, they will look probably for somewhere else and by that time you’ve lost them.
I avoid standard reviews supplied by the affiliate programs because a) they are one-sided and b) you end up duplicating what a load of other affs are doing and may end up with “duplicate content” penalties in Google. Home-made reviews are the only way IMO. Show the players you know the casino well and be up-front 
You”ll earn more respect and trust that way and need less traffic to do well.
Bear in mind that whichever way you go, it will take 6 months to even start to get any decent results in search engines though. But don’t spam forums – just be patient and develop your content to be useful. Think as if you were a player – what would you want from an affiliate site? That’s key.