nono you misunderstood, it has menues, but they are mildly unstable. I can go to a chapter menu and select things, but it functions best when you hit "play all" and then just hit the next scene button on the remote.
I am getting an alternate rip anyway, since i don't consider this completely stable, but it's enough to make me finally settle in bed and sleep after a day-long war campaign against this "funky" iso, as you aptly so named it.
Anyway, i think your suggestion to spring for another DL dvd+r brand was what solved the problem for me, regardless if it's sony or whatever. It worked, and i probably would have been reluctant going for another +R, so thanks for that.