If the main theme of this line was Quintessons, I would be buying less figures than I already plan to considering most of my buys from this line are the modulators, or other base forming characters.
I enjoy the little base building aspect of the Modulators because they're neat little $20 bases, designed to be bases, as opposed to the $50 scrapheaps from Titans Return. Plus, not every kid is going to the $150 Titan class figures for the Micromasters and Battlemasters to operate, so these are a good alternative.
It's not everyone's cup of tea, but I like that we're getting a cheaper way of city building as opposed to using the (mostly) forced base modes from Titans Return, and trying to figure out how to force the Titans to work together for a city. Plus, I can't wait to have a little display with Omega, Sky Lynx, and the Astro-Squad all getting ready to launch. I would include Astrotrain, but I kinda prefer his Train mode.