The challenge of course is to think of the positives, not just the negatives! But let me give it a start and see if anyone would care to add to the lists.
What has succeeded
- Wider variety of mass texts for saints. I don't like the calendar revisions and lectionary as a general thing, but the EF's range of readings for feastdays is very restricted indeed, particularly noticeable when you get a run of female saints (there are days when I really don't want to hear about the wise and foolish virgins yet again)
- Intercessory prayers (although they can be subverted by vagueness, wishy-washyness and political correctness)
What has failed
- Sign of peace (see my previous post!);
- Sung/said response to the 'mysterium fidei';
- Lectionary - at least with the EF the congregation gets to know the parts of Scripture that are used (especially the Gospel of St John) well;
- multiple Eucharistic prayers, said aloud.
This is just a starting point obviously, so do add your two cents worth....
PS I should make clear that I'm not advocating that any of the 'successes' be incorporated into the TLM - my personal view is we need some stability at this point, so that it influences the NO positively. And I have a list of things stripped out in 1962 or a little earlier that I'd put back into the TLM (like a few more Octaves for example) if I had my way!