Yeah without looking at the numbers and just by the skills themselves I'd say Ninja will be lower than Monk DPS wise, it has a few more Support abilities.

With that in mind though Ninja will have higher burst DPs like bard and don't be surprised to see them sailing at the top of the aggro charts at the start of a fight. (no way to lower emnity generated)

Hide --> Trick Attack --> Perfect Dodge --> Featherfoot might just be the opener :P