What they got right: I keep saying they should give Ben and the gang their own comic, like Batman: The Brave and the Bold has. Outside of Samurai Jack (does Megas XLR ever show up anymore?), it's the only reason to read this comic, at least for me. Mike Cavallaro handles the old cartoon's look well, as Min S. Ku does with the modern style. Obviously I haven't seen the movie yet, so I can't say how well the tie-in works, but it certainly looks like the cartoon, rather than trying to drawn the live-action actors.
What they got wrong: Well, a curve should be thrown on this one. It's a set-up for the Alien Swarm movie, so they have to introduce characters that were never in the animated show, but apparently play an important part in the live-action movie and are part of Max's past. Unfortunately, this makes it difficult to get into the characters or learn anything important about them.
Recommendation: If this would somehow lead to a full Ben 10 comic in any period, I would be happy. Otherwise, I can't fully judge it until the movie airs. Still, what I can tell is a decent job. At least worth a look through.