Man between spending my evenings catching up on E3 coverage a couple of weeks ago and Pushmo World since then, I've gone for like two weeks without playing any MK8. Gonna be so out of practice once I get back into the GAF rooms!
Also sign me up for the group that believes that skill plays a much larger role in race results than pure luck. Frankly I felt that way even about MKWii, where if you were a solid racer, most of the time the blue shell was the only thing that could ever really stop you from taking a lead and keeping it. Most other item-based shenanegans were blockable, avoidable, or could at least be easily mitigated (POW-block momentum conservation was a huge technique, not doing it definitely put you at a disadvantage). Knowing the courses and their shortcuts, having a solid vehicle build and a playstyle that takes advantage of it, having solid racing lines planned out so you know where you're going, and collecting coins all give you an edge. This is supported by what I feel like is a big increase in mushroom-related items given to folks in lower places, as it encourages you to know the boosting shortcuts and pick good spots to make your moves.
Granted, when the three people ahead of you also get mushrooms that can fall kind of moot, but everybody gets items, so what can you do.