Microtransactions are new and worrisome. DLC, they've so far treated more like traditional expansion packs (from what I've seen), rather than short-changing the core game so they can easily soak buyers for extra money for what should have been the full version to begin with, as has become standard practice in much of the rest of the industry. I didn't notice e.g. base Mario Kart coming with notably-few tracks or anything (we've paid for zero of the DLC for that, and have plenty of tracks, don't remember Double Dash or other older ones having more)