This big movie Memorial Day weekend, though no longer the official start of summer movie season, brings us too major tentpole releases from the big studios: Warner’s “Terminator Salvation” and Fox’s “Night at the Museum: Battle of the Smithsonian.” The PG-13 Terminator reboot attempt is directed by McG, who Bullz-Eye’s Jason Zingale (who kinda sorta liked the movie) terms a “poor man’s Michael Bay.” Other critics were less charitable, and the film is getting easily the worst reviews in the entire history of the “Terminator” franchise, with the Rotten Tomatoes crowd giving it an underwhelming 35% “fresh” and generally seeming a little angry with star Christian Bale for walking into their collective eyeline. Not that any of that will matter to weekend grosses — and I do expect this to be the big winner of the long holiday weekend. However, if audiences agree that it really is inferior to prior “Terminator” flicks, it’s possible there will be a bigger drop-off later than expected. Still, at last night’s midnight’s screenings, it raked in a cool $3 million from the Red Bull drinking legions.

The sequel to 2006’s entirely unacclaimed “Night at the Museum” should also do well regardless of notices because it combines the only sure formula for box office success — a kid-friendly production that offers something, anything, to parents as well. In this case, Ben Stiller and a very strong supporting cast, even if the result had Roger Ebert squirming in boredom and remembering one of the truer critical refrains of all time:

I found myself yet once again echoing the frequent cry of Gene Siskel: Why not just give us a documentary of the same actors having lunch?

Still, the parents I know are mostly grateful for any movie that doesn’t involve CGI rodents eating their own feces, and at least this one encourages kids to go to museums.

And there is another option, that is the latest, at this point entirely unreviewed Wayans Brother’s spoof film from Paramount and MTV, “Dance Flick,” which at least has a reasonably funny trailer and Amy Sedaris (sister of writer/public radio superstar David Sedaris, frequent comedy companion of Stephen Colbert, before he was having portions of space stations named after him). Carl DiOrio says it will do well if can break out of the euphemistic “urban market”? Young folks looking for a comedy will likely go if they can’t get into something else, but something tells me that both “urban” people and their paler “suburban” friends will have other films to watch considering that, new releases aside, “Star Trek” and “Angels and Demons” are still very strong at the multiplex.

In limited release, we have Steve Soderbergh’s “The Girlfriend Experience” starring thinking man’s porn star Sasha Grey in a sexy but non-porn role which makes it something of a must for cinephile horndogs the world over. And because I’m the retro-guy who occasionally likes the same movies your grandma does, I feel compelled to mention both “The Boys: The Sherman Brothers Story,” about the guys responsible for the vast bulk of the pre-“Little Mermaid” Disney songs, and the Noel Coward adaptation “Easy Virtue,” which looks like it would go down very well with a nice dry martini made with a good, dry English gin. But you’ll want to see Sasha, won’t you?

UPDATE: Apparently some disagree with what I thought was a conventional-wisdom friendly guess about the weekend’s winner, since “Terminator” is such a time-tested franchise. Nikki Finke says it will be neck and neck but those famed “insiders” are predicting immense numbers for “Museum.” We’ll see.