Much like Borat, Bruno is a thinly plotted series of sketches where Cohen admirably keeps in character through largely unscripted interactions with celebs and regular people meant to expose prejudices and biases we'd rather not confront. And also like Borat, it's shockingly, blisteringly and bravely funny.
Instead of ethnocentrism, this time the target is homophobia, altho Bruno does take a bit of a shotgun blast approach, scattering some laughs toward celeb and pop culture as well. The movie doesn't vary too wildly within its 86 minutes, sticking with the basic setup of Bruno sticking his... ah... nose into unprepared situations and pushing the joke far past any arguably point of good taste.
So while some of the jokes hit harder than others (the scripted setups that advance the story are less illuminating and amusing), pound for pound it's consistently and painfully funny. I wasn't around for classic comedians like Lenny Bruce, but I have to imagine that Cohen represents that spirit for this generation. Debased, dangerous and definitely worth a watch.