it depends how you spend those 200-800 hrs...
Airline cadet programs are mostly about 250 hrs and then straight to the typerating and linetraining. Usually something like this...
130 Hrs in a single engine like Beech 33 Bonanza to get your ppl, ifr and cpl
30hrs in a twin like a Beech 58 Baron for multiengine and ifr
80Hrs in a Level D simulator simulating a turboprop like Cheyenne IV or jet like Citation for multicrew and ATP training
10 Hrs with the corresponding TP/JET for line orientated training
....ready for first typerating on A320/B737 or similar.
Thats 250 Hrs hardcore training, which you can not compare to 300hrs flying circuits in a C150 as CFI...
besides you had about 1500-2000hrs groundschool during your cadet program... that might help a bit too...
however if you got the job doing only circuits in C150 then that might be interesting when the old man goes inop...