This weekend features the first real battle for No. 1 at the box office in a while, pitting Dwayne (“The Rock”) Johnson against Oscar-winner Jamie Foxx. Most prognosticators, like Gitesh Pandya at Box Office Guru, are predicting a narrow win for Foxx and “The Kingdom,” a Rambo-esque fantasy of FBI agents gunning for terrorists in Saudi Arabia. But Steve Mason at Fantasy Moguls thinks “The Kingdom,” which at least pretends to be an adult movie (it’s got an R rating), will be hurt by poor reviews. I pan it with 1.5 stars today, and the notices are running just 49 percent favorable (and an appalling 29 percent among major, “Cream of the Crop” critics) at Rotten Tomatoes. The scores are even worse for The Rock’s movie, the family sports comedy “The Game Plan.” Kylerips it a new one with a single star, and the RT score is just 37/43. But for people looking for a PG alternative in a marketplace loaded with grim, R-rated flicks, it’s the only game in town. Mase thinks it will pull an upset with $21.3M against $16.5M for “The Kingdom” (Gitesh has it the other way around, with the figures as $19M and $17M). The other wide release is another half-hearted throwaway from the once mighty MGM and the once-great Robert Benton, the schmaltzfest “Feast of Love” with Morgan Freeman, Greg Kinnear and lots of female nudity. I give it a big thumbs down (one star) and the RT score is 45/42. It’s improbably opening at 1,200 theaters (“The Kingdom” and “The Game Plan” have around 2,700 apiece) and is expected to do in the vicinity of $2 million — roughly the same as “In the Valley of Elah,” expanding to 700 screens.