It use to be 100%, rrrix just still has a few bugs to work out after the latest patch. Patch is still fairly fresh and rrrix has many other priority projects he has been working on. Ive tested it on 4 different machines, 4 different characters.. You've seen my post on that forum, there are a handful of trouble spots still, but you can manually pass them by checking in on it after a few hours.
A1 - Chancellors Alter (still has problems entering the tombs) ---- If you start it after that quest, or help it get by it, it should run all the way upto the shadow locks (assuming you have changed wp=8 instead of 7 in your a2_rrrix.xml file @stepid="25" meintown), after the betrayer questline it should be smooth sailing through the rest of a2, and all of a3. Next problem area was A4- corrupt growths, still gets jammed up there as well..
Hope that helps.. Goodluck