You make some very valid points, not least the fact that the Green List badly needs updating. For what it's worth, here are my views bookmaker by bookmaker (I don't expect everyone to agree with me, but it's high time the issue was debated):
Stan James: for me 3.5 these days and so no longer on the Green List. Still above average in the overall scheme of things, but markedly worse than they used to be (closing accounts far too quickly, placing restrictions on certain deposit methods and with promotions which don't always seem to be what they purport to be).
Totesport/Betfred. Fully agree that they should have the same rating, as they are effectively the same company nowadays. I would have them both at 3.5. I think 3 is a bit low for Betfred, but 4 is too high for Totesport. They are both above average, but still with room for improvement (Betfred in particular limit accounts very quickly and have one or two restrictions to their promotions, e.g. that Best Odds Guaranteed on UK and Irish horse racing does not apply to certain bet types).
Betfair Exchange: clearly should be on the Green List, although I'm no great fan myself (premium charge etc.). For me 4.5. I've never used their sportsbook, so can't comment.
Skybet: haven't used them for years. When I last used them, my experience was ok despite one or two reservations. That said, I've seen a lot of positive feedback on them over the last couple of years, so a BMR rating of 3 looks too low these days.
Ladbrokes: still worth a place on the Green List, but not as good as they used to be (zeroing accounts left, right and centre and offering odds which are generally on the skinny side). Should be 4 in my view. I would also rate Betdaq as 4 and add them to the Green List.
Paddy Power: 4.5 for me. Limit accounts a bit quicker than they used to, but odds remain decent and customer service is as good as any.
Coral: haven't used them for years, so can't really comment on whether they should still be on the Green List or not.
William Hill: still one of the best for me (although I am aware of the problems Mile has had with them for the last eighteen months). Decent odds for the most part, good limits, a great range of markets and helpful customer service. 4.5+ in my book.
Bet365: don't use them these days, but they continue to get plenty of positive feedback despite some players complaining that they can be overly fussy with regard to KYC procedures and are a little quicker to limit these days. I would have them at 4.5.
BetVictor: my experience has always been positive - reasonable odds, good range of markets, very good limits, efficient customer support. I am aware, however, that they persist in closing certain accounts at the drop of a hat and that is not to their credit. Nonetheless also 4.5 for me.
888Sport: I've never used them, so can't really comment in detail. They have a good range of markets, but their odds strike me as only average and their KYC procedures seem unnecessarily complicated. If they should be on the Green List, then so too, for example, should be 32RedSport (with whom I do have an account) who are also powered by Kambi Sports Solutions and so have the same odds but a much more straightforward KYC procedure. I would have 32RedSport at 3.5 at present (their customer service can be a bit hit and miss, but overall I think they are well above average and are trying hard to improve).
There are other bookmakers both on and off the Green List that I could comment on, but I'll leave it there for now - feel free to agree or disagree with me as you see fit.