Some of our very best philosophers engage in effective, polemical ridicule:
But there is also:
Now, reflection on this very small sample (add your favorite example in comments!) inclines me to delimit a certain genre of philosophically effective ridicule (as opposed to mere character assassination); this genre, relies on the magnification of a core philosophical commitment of the opponent and thereby render the whole project preposterous or laughable. I label this a 'Swiftian-Rabelaisian strategy.' Nietzsche's writings are littered with attempts at Swiftian-Rabelaisian strategy, although he often suggests that the contrasting strategy -- ridicule by way of minimization (e.g., Berkeley on minute philosophers) -- comes more naturally to him.
Of course, such a Swiftian-Rabelaisian strategy is compatible with the existence of effective arguments against the ridiculed opposition (as well as the existence of argumentative rejoinders). It is also compatible with holding a rather austere (what we may call, adopting a phrase from Derrida) 'ethics of writing'. Given the sample, I hasten to add that even if the meta-ethical-writing-principles were shared, the enacted norms of writing may differ widely. We should distinguish the Swiftian-Rabelaisian strategy from other forms of ridicule (which, say, rely on misrepresentation, incredulous stares, silencing techniques, etc.).
I conclude my preliminary analysis by way of a suggestion; in some possible world it ought to be possible to execute the Swiftian-Rabelaisian strategy under, as it were, the radar without, say, being funny. To give a hint of an example: when Locke takes on the stance of an 'under-labourer' he magnifies some privileged others (Boyle, Sydenham, Huygens Newton). Nobody would ever accuse Locke of being a funny writer, but it would be amusing if he were capable of an inside joke.