A lot of the comments above seem to be focused on whether or not the film-makers got the tanks and trucks right, yet at the same time, the writers admit they loved the movie. Me too; and I don't give a damn about the equipment, so long as it's reasonably close to the real thing.
Here's the point: a war film that tackles the big issues which the war itself was partly fought over is such a rare bird and especially one that's combined with some good character writing and knockout action sequences that one should embrace it. The movie gives us spectacle, yes, but it does so in a thoughtful way, a remarkable achievement when one considers that the typical war movie of the era was more like "Where Eagles Dare" than this one, ie, a farrago of nonsense designed to showcase ludicrous special effects sequences.
"Tobruk" may not be the literal truth, but it shows people committed to and fighting for beliefs and ideas, and fully prepared to sacrifice their lives if necessary to achieve that greater good. Stirring stuff, and the editing in the final tank sequence is nothing short of amazing.