To be fair to the writers, the "out" for Data's death was as heavily foreshadowed in Nemesis as Spock's resurrection was in The Wrath of Khan. I'd have been disappointed if they HADN'T done something with it.
Like I said in the Indistinguishable from Magic thread that this book inspired I don't care if it was foreshadowed I still don't like it.
And I after reading the first DC Comics TOS series set right after TWOK I feel the same way about Spock's ressurection.
And I have to say that Mack's resolution is far more organic, natural and meaningful than Data simply re-emerging within B-4's body, as Star Trek Online chose to do it... I've never quite bought that B-4's less advanced systems could "run" Data's software at all, even long enough for him to advise people on how to upgrade them (as STO would have it).
I really don't care how organic it felt a cop out is a cop out.