Corrected entry: In the second film Magneto escapes the entire prison with only the aid of 3 ball bearings. He could have easily ripped the cars apart and used them as bullets against the troops guarding Lech and hit them with 100% accuracy or even made the cars spin like tops and slam into the guards. All he did was throw cars in random directions and let Pyro light them and hope for the best. This goes beyond a character mistake, as Magneto's often been shown to make very good use of metal around him, whereas here he just doesn't bother so it benefits the plot.
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Correction: Still, it is his choice to use the cars as artillery shells rather than bullets. Maybe he just wanted to attract attention while his fellow mutants got to Leech, maybe he simply wanted a big, flashy and intimidating show for the humans watching. It is impossible to say for certain what a character's motives are, based on such circumstantial evidence as this.
Twotall