 If you liked
Majin Tantei Nougami Neuro
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 ...then you might like
Gyakkyou Burai Kaiji: Ultimate Survivor
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The art style in both has a certain stylistic "bad and unattractive, yet awesome" quality to it. This is more apparent in the manga versions of both series, but the animation manages to capture that. In addition, both series have a lot of battles of wits, Kaiji with its gambling and Majin Tantei Nougami Neuro with solving detective cases. Add a little extremism - for example Neuro's physical and mental abuse of Yako and the ridiculous stakes Kaiji wagers in some of his gambles - and it's easy to see at a glance why a fan of one would enjoy the other.