What they got right: I like how they're using the Target comics in official IDW Movieverse canon. Wreckage isn't in the movie and was one of the toyline exclusive. I do like how IDW has used the non-movie character toys in both this and Reign of Starscream. There are other toy easter eggs, like Ironhide blowing up his G1 namesake's alt mode, and the hologram Prime uses was also used on some versions of the Movie Prime figure. We get one more look at original character Salazar (from RoS). Starscream even mentions the failed All-Spark 2 and betrayal from the last series. The backgrounds and Transformers are well done.
What they got wrong: Unfortunately, while the normal humans are well enough, the actual movie humans don't match the actors as well as in the past. Lennox is hurt the most by it and looks nothing like Josh Duhamel, although Epps also loses a bit of Tyrese Gibson's look. Mikala looks more like a manga version of Megan Fox, and Sam/Shia, while the closest to the actor, is still off target. I've never recognised Simmons as John Tuttoro in any of the IDW comics, so that's nothing. He's not written as big an idiot as he is in the movie (just like the other movie prequels), so it's off character, but I find him more believable IDW's way. Perhaps the actors didn't sign off on their face usage for the non-adaptations, but at least it's better than IDW's Ghostbuster comics.
Recommendation: If you like the movieverse, and IDW's "fleshing out" of it, it might be worth checking out. Some may decide to wait until the trades, but since I like my comics better this way, this is what I'm going for.