Here's but one scathing highlight, from the New York Times:
[Adam Sandler's] recent feature-length gags are tantrums of entitlement. In “Jack and Jill,” as in “Grown Ups” (both directed by Dennis Dugan), he plays a guy with a more or less perfect life — cute kids, cool job, big house, hot wife — who is grievously annoyed by people variously defined as losers. This expansive category includes anyone who can be mocked for reasons of hygiene, physical appearance or ethnic background, though at the last minute, just to prove what a nice guy he is, Mr. Sandler will substitute condescension for contempt.
Mr. Sandler’s subtly self-lacerating performance in Judd Apatow’s “Funny People” suggests that he is aware of the hollow, hateful side of what he does for a living. “Grown Ups” and “Jack and Jill” prove that, as long as it pays the bills, he doesn’t care. The essential ugliness of Mr. Sandler’s brand of comic bullying — which is punctuated by notably brutal bits of slapstick — is not lessened by his playing, in “Jack and Jill,” the principal target of his own scorn. On the contrary, Mr. Sandler, done up in frumpy, bargain-shopper drag as Jill, gives full and relentless voice to the woman-hatred that has always propelled his infantile shtick.
But Jack & Jill isn't a complete waste of space, as it made possible the amazing (and fake) Jack & Jill promotional Twitter feed. A sample:
I predict Razzie wins for both Worst Actor and Worst Actress for Adam Sandler.