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LEAD: The idea that alien forces control trx suspension trainer for saleour media, making subliminal use of billboards, commercials and magazines to subvert our thinking, probably isn't that hard for most of us to believe. So credibility isn't the problem with John Carpenter's ''They Live, '' which opens today at the Movieland and other theaters, but execution is.

The idea that alien forces control our media, making subliminal use of billboards, commercials and fake gucci shoesmagazines to subvert our thinking, probably isn't that hard for most of us to believe. So credibility isn't the problem with John Carpenter's ''They Live, '' which opens today at the Movieland and other theaters, but execution is. Mr. Carpenter has directed the film with B-movie bluntness, but with none of the requisite snap. And his screenplay (written under the pseudonym Frank Armitage) makes the principals sound even more tongue-tied than they have to.ray bans on sale

B-movie casting is another problem, since the star, Roddy Piper, plays his role like the former wrestler that he is. Mr. Piper appears as John Nada, a generic drifter who finds his way to Los angeles as the film begins. The best part of ''They Live'' is its opening, when the story still holds some surprises and the promise that it may catch fire. Nada wanders through Los angeles, gets a job as a construction worker, and is led by a new buddy named Frank (Keith David) to a shantytown called Justiceville, where he gets his first real inkling that things may not be what they seem.