I have some 6000 plus hours on 737’s, flown the 200, 300, 400, and the 800 , presently flying both the 400 and the 800 ....
Bottom line ........ the 200 was an awesome aircraft, the ‘Ferrari’ ...... from there on things got worse, 400 is a truck but a great aircraft , and in the words from an esteemed colleague , to which I agree ..... Boeing has never built a ‘crappy’ aircraft .... but they did come close with the 800