I still have huge problems finding groups through group finder - it doesn't seem to matter whether I queue solo as a tank or healer, or in a small group of two as tank and healer.
Some things that I have noticed (but that could also be pure coincidence):
1) It is (way) more likely to get into a random group when searching during the day, as opposed to in the evening.
2) If I search a group after ~7 PM (CEST) I can be queued for 3 hours at a time and not find a single group (sometimes I try leaving and entering the group finder queue every 15 minutes, but that doesn't work either. I've done tried for at least 15 evenings during the last month or so (weekdays, weekends, holidays - nothing seems to improve the chances for finding a group)
3) I can (pretty reliably) find a group if I limit my search to specific dungeons (the choice of dungeons doesn't seem to matter though) - however, I'm losing out on the daily (XP) reward, which is one of the main reasons I'm trying to find a group in the first place.
Is there any chance that the group finder will be fixed in an update not too far into the future? To me it has been pretty much broken ever since it was supposedly fixed. And tbh, not being able to consistently get random groups is the main reason why I decide not to play ESO at all on many days.