I got Fast and Furious 6 as a Christmas present from The Younger Son. I'm a big Vin Diesel fan, though I'll admit it took me a while to learn to appreciate that first film in this series. This one is great fun, and I continue to look forward to any of these that are released with Vin Diesel in the cast.
Empire Online gives it 3 out of 5 stars and calls it "a big screen no-brainer that’s objectively terrible but undeniably pleasurable". EW gives it a B+, calling it "a borderline ridiculous, over-the-top demolition derby that also happens to be a perfectly constructed low-IQ blast". Slant Magazine doesn't like it, giving it 1 star and saying, "To call the film stupid would be misleading, as it's built on technical intellect, from the stunts to the visual effects to the sound team. No, Fast & Furious 6 is far more smug than stupid, luxuriating in its cynicism and insubstantiality." DVD Talk calls it "popcorn film of the highest order". Roger Ebert's site has a mixed review, calling it "not a great action movie" but "solid entertainment". Rotten Tomatoes has a critics score of only 69%, but audience ratings are much better.