What they got right: Tony still does a good job capturing the attitudes of the previous incarnations, such as 6's inflated ego. (I believe Colin once said that had he continued on that would be toned down as the problem regeneration would be righting itself.) This issue has a few more clues to what's going on, mostly from Martha that puts this story in a different place in time that I had thought. Confirm that with the spoiler on the last page. I can hear all the actors in my head again, and Lee really takes stock of the little things about the characters that might be missed in a short story. There's a love not just for the new series but the "classic" Who that you can feel in the stories, unlike the previous mini that seemed a bit overcharged in the wrong spots.
What they got wrong: Storywise and artwise, nothing. Yates' style doesn't match Pia's as well as Martino did last issue, but it's still good. Any complaints are just personal ones. (In case you don't want to know who the companions are:)
CLICK TO SHOW SPOILER Granted that much of my interest in Peri is for the "wrong" reasons (I'm straight and single–that says it all :D), but I would have liked to have seen more of her (not that way, you perverts!) in the story. Admittedly, she hardly had Ace or Martha's presence as a companion, so I can't fault that. (I doubt these companion picks, and not the use of Mel counts as a spoiler. I'm sure you saw it coming. But just in case...)
I do wish we had seen more of the classic TARDIS control room. One panel last issue and I think there was a shot with the First Doctor but I can't remember. I'm just not a fan of the new series TARDIS control room, and the next two Doctors don't use the classic room. (I am curious to see if they use the 8th/Fox room somehow in the story.) I'm also hoping that we get a maxi-series someday like "All Hail Megatron" that the Transformers are getting. Then each Doctor could have their own story, perhaps with a connecting event, like a huge "Key To Time" style story. However, these are just to cater to my personal tastes, and I doubt anyone at IDW is thinking "I wonder what that one guy wants to see in the next comic", or the next Transformer comic would be a Bumblebee/Swoop buddy story.
Recommendation:If you can't find all of the previous issues, wait for the trade to come out. This story is proving to be a must for any Whovian. Hopefully the payoff is better than Russel T's last two season finales.