Watching Journey's End and boy was that finale one big epic destruction fest. Still, it was the perfect two episodes to show because it really does cover Tennant's entire era as the Doctor. I almost forgot how great he was in the role, better than Smith I think.
The more I watch the episode the more I think, from my perspective, this is a pretty good 8 year anniversary episode. So you don't have Smith and Eccleston, but you have the longest tenured Doctor in the 5 year span, all the companions, and plenty of Daleks, not to mention some great loud music which is a Staple of new Who. What more can you ask for.