Tons of fanboys are out on the street hunting for Shane Black simply, and only cause of the twist. Majority of GA, from what I can tell, like it, or okay with it.
Agree about the airplane scene, I think it's beautiful.
As for the humor, I think there are many here who don't like Black's style of humor. I personally love it as I do his other movies.
There are also criticisms about some plot lines that I can certainly understand.
Overall, I'm like you mostly, enjoy the humor, the action, love the acting performances (from RDJ the most obviously )