The ifl file type is just a renamed PBO so no difference there.
For the crashes see the troubleshooting at the offficial forums (apparently turning off AA in game and on nvidia/ati app stops crashes.
Patch 1.03 is in final test stages.
You are able to complain although having the "right" to is debateable, but perhaps asking for assistance with your particular issues might help you get to a playable stage?
if you had OFP, do you not remember all the CTD's at the games beginnings? A2 was quite problematic as well on release.
Head over to the official forums and folk will try to help you out. (they're a bit busier than the area here.)