(And the answer to the above question, folks, is "Who the smeg cares?")
I write this because, having just finished IDW's Star Trek: The Next Generation/Doctor Who Crossover (interestingly titled Assimilation 2), I have to say that I was....well, I liked it, but probably not as much as I would have wanted to enjoy it.
Much of it is Scott and David Tipton's writing (along with Tony Lee, who cannot do wrong, as far as I'm concerned) - this issue is mostly set-up for the rest of the series, and much of the characterizations are pitch-perfect. Although I enjoyed the story, and would buy issue two, I did feel a little...well, underwhelmed by the writing. Maybe it's the fact that I've been so immersed in both Star Trek and Doctor Who fandom that I feel a little put out (I remember a time when both fandoms regarded the other as "the enemy"), but maybe much of it is my own burnout around putting together two franchises.
The real treat - for me, at least - is J.K. Woodward, who fully painted the art in the book. Although the overall tone of the book may not fit the art style, I actually found myself drawn to the art (pun fully intended) - in a way, having a slightly photorealistic style helps bring the story to life somewhat...and which makes me feel a little bit more enthusiastic about the series.
It also helps that Woodward is genuinely enthusiastic about the project - here's an interview I did with him at C2E2 for Comic Related:
Although I have some reservations, I do think IDW's Star Trek/Doctor Who crossover is worth a look.