I keep seeing post like this, I guess I have been lucky. I have bought two Hatsans. My AT44-10 and my Proxima. Both have been great. I have one opportunity to deal with Hatasn USA over a seal issue on my PCP's air tube. Hatsan USA responded promptly and took care of my issue. I've had no problem with Hatsan at all.
I know one problem that many have had, but I feel it is a misunderstood. Any time you have a problem with a Hatsan, take the time to fill out the form !!! Don't just get on the phone or bombard them with e mails.
I have something like 23 between Hattys and Turkish built Webleys and the only problems I've ever had were caused by me tinkering.