The right tool for the right job.
I'd counter recommend this. In my limited experience with it, dynamic PPC landing pages are so effective as to be almost cheating.
BCC's AdWords campaigns are not doing well in 2013 for what I believe are unrelated (and mysterious) reasons, but the ~20 lines of Rails code which make URL #1 and URL #2 roughly the same today but will automatically switch URL #1 to a different creative in a few days have been worth, guesstimating a number here, somewhere north of $20,000. (Bingo cards are a very seasonal market. For the last couple of weeks, most teachers have been in the market for Thanksgiving bingo cards. This will not be true in a few days. The #1 URL, which I use for many of my campaigns, uses some really dead simple heuristics to guess which creative to show people. The heuristic was worth > 10% lift in conversions versus alternatives like "Pick our most popular activity ever", "Pick an activity at random", and "Pick Patrick's guess at what would convert best."
http://www.bingocardcreator.com/lpc/thanksgiving <-- There are actually about ~900 landing pages like this, which is a trick that few people manage if they do them in static HTML.
You have some code that infers from usage that, for instance, civil rights cards are popular in late January (Martin Luther King Day is on January 20th)? Neat! :-)
This particular client produces television advertisements. Videos are pulled in from Vimeo, photos and text updates are pulled from Tumblr. The API data is cached locally with serialized objects to keep it speedy.
Since they already had active accounts on both services, initial content population was minimal. We were even able to use categorization strategies already present on Vimeo to organize content.
Jekyll would disagree.
According to most definitions of "CMS", it is. With static website generators, editing, versioning, publishing, etc is done externally. They aren't systems which encompass all of this. They just punch some content into your templates and write the result to disk. That's all they do.
From what I've seen of Drupal, the interface exposed to content creators is awful. It works (mostly), but it ain't pretty.