big size - it's matter of wrappers; CocoonJS gives smaller APK, Crosswalk much bigger;
Sprite Font works fine;
AdMob works fine (at least on my CocoonJS projects);
"On Collision" works fine;
and so on
so as Ashley would said it's better to report a bug if you really have some bad problems
in my opinion the most ugly issues are the Google Play e-mails received by some users, that they should update their apps because of some security reasons