Look, I liked Kala as much as the next person, but it's a mediocre, derivative album. In and of itself, that isn't a crime, but M.I.A. seems to think she's the second coming of Joe Strummer. Being a blustering idiot in interviews is problematic if you don't have the goods to support your ego and I don't think lifting Clash/Suicide riffs and then sprinkling gun shot sound effects is adequate artistry.
Further, I get the distinct sense that her politics are amorphous and ill-founded. In my mind, there is something distinctly problematic about supporting the Tamil Tigers without being able to articulately explain your reasoning (and I have yet to hear her do so). I can sympathize with some of their goals, but I would love to hear M.I.A. explain away their gross human rights violations such as child soldiers, civilian attacks and ethnic cleansing. They are, fundamentally, a terrorist group and should not be made into a trendy, contrarian political ideology for the sake of getting attention or appearing rebellious. It isn't much different than wearing a shirt depicting Che's visage without the knowledge of his actions to defend that sartorial choice.
To put it bluntly: She irks the hell out of me.