B737C525......... I agree to a point, aircraft such as the Grob115, SAH1, Beagle Pup, Robin400, SlingsbyT67, Chipmunk were much better aircraft both from a handling point and visually.
I would say that the Cessna150/152 is a stable training platform which is why so many flying schools opted for them. From memory when the civilian version of the Grob115 was introduced, they were modified to reduced the rate of roll, as 'Cessna' pilots found it difficult to handle!
From memory the C150/C152 did not really have big wing drops unless really mishandled. The C150's 40 degree flap had its uses, but could be a handfull for student pilots on a go around, hence I beleive the reason Cessna only fitted 30 degrees on the C152. The Cessna 172, 182 and 206 all retained 40 flap.
As to loading, again from memory with anything above two pilots weighting 12 stone, you can not fly with full tanks, yet for many years people have! To add with two pilots at 12 stone it is pretty cramped.