I'd seen other commentary to that effect in reviews, but this article gives examples and reasons.
Enjoy some quotes from other reviews. My favourite is, "an overwhelmingly sad experience" – Andrew O'Hehir, Salon.
minor spoiler eta: "So Pixels ends with the only likeable character and the only non-bullshit incarnation of its own premise [Q*Bert] blinking out of existence so that one of two vaguely prominent women characters in the entire cast can serve as a literal trophy. Holy fucking shit." -- MovieBob pulls no punches.