Tumblr is easy to set up, and pleasant to use. Some will say it misses features, but I disagree.
Here’s a simple exemple : I spent at least 10 minutes googling a way to show my tweets in tumblr with some special CSS, until I realized it was as simple as linking the Twitter account to Tumblr.
No CSS needed for that. If there had been no such feature, I wouldn’t even have searched for a way to use it, but figured that there must be another way.
Tumblr doesn’t need more features- as St-Exupery said, perfection is reached not when there is nothing else to add, but when there is nothing else to remove.
Of course, a better documentation of the Twitter linking feature, for exemple a tooltip saying it would then show the latest tweets would also have been handy.