IMO, zebra danios are not that bad. They are just active, which is what danios do best. Don't keep shy fish with them and they will do well.
IMO, Rift cichlids and Neotropical cichlids are not good community fish at all. They are fierce, grow big and eat smaller fish and inverts. BUT, that said, they CAN be kept in a community tank, IF the tankmates are chosen correctly.
Thus, I would think there are no bad community fish, one would just have to choose their tank mates, decoration and tank size accordingly to achieve a successful community tank.
Ah, that said, the answer would be different if you were asking about worst community fish in a planted tank. Or if you were to set some limits as to the kind of fish in the community.
But I digressed...
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