There's nothing comparable on the market. Sure it would be good, if it could export to native, but I'm totally fine with HTML5.
Construct is almost exactly the same as MMF2 (now called Clickteam Fusion). In fact based on a previous post in this thread, Ashley used to be pretty well known in the MMF2 scene back in the day. My guess is that Scirra got fed up with its limitations and made their own.
MMF2/Fusion DOES export Native, and it works pretty well. The downside is though you have to pay for the software and then pay for the individual exporters (The software starts at 199. 399 is you want the developer version (Some plugins only work on developer). The iOS exporter is 180 I think... Android is about 80 or so).
I think Construct has potential but it needs more time to grow. As does the performance of mobile browsers. I would love to somehow make my own accelerated webview that can talk to the base OS. I just don't have the time to do that now. I hope Crosswalk grows in the next few months and can be useful and I hope somebody figures out a better way to get iOS support than to go through Cocoon.js.