Interesting discussion. Much has been said that was on my mind as well. While I love and prefer the usablity of the event editor in Construct 2, and in fact I'm also using C2 almost exclusively these days, I still do think with a heavy heart of good old CC.
Its DirectX engine just packed a different punch. Just think of effects and sprite distortion. And in regard of what has been said earlier, about C2 rendering faster than CC - I don't think that's a realistic scenario. Like Ashley said in the previously linked blog article:
avascript is not faster than C++ - this is not what we have proved. Our Javascript engine does less, which helps explain how with just the right circumstances it can edge ahead of a less efficiently written C++ engine.
The right circumstances... which in reality comes down to using Chrome on a recent Windows distribution (or export as EXE which is based on Chromium). So all the other exporting options fall short due to mostly severe performance problems, unless you create a really simple game.
So many exporters are awesome in theory, but in reality many platforms aren't very feasible right now. I don't know if something like haxeNME would be able to improve the situation. Sure sounds intriguing though.
At the end of the day I do think HTML5 has come far regarding game development, but as a true all platform covering solution it still falls flat on its ass. Nevertheless I hardly use Classic anymore, mainly because I'm not willing to put up with the always pending instability of it all anymore. In that regard working with C2 is a much better experience.