Faced with the unenviable task of coming on the heels of the biggest movie opening of all time as well as being a reminder of recent and tragic events (the Trayvon Martin shooting) “The Watch” was basically going to rest on the likable charisma of its lead actors. This is the type of R-rated comedy you want to see from Stiller, Vaughn, and Hill and yet the comedy struck me as largely innocuous. Evan (Ben Stiller) manages a Costco in Glenview