I'm sorry to hear about your experience Oxford. It does sound dreadful and N&S should be very embarrassed. I would make a few points based on my limited experience. First, you will find that going bespoke is worth it but only if you are patient and judicious. It is very tempting to plunge in with a big brand shop, but as you have learned, that is risky and costly. Better to give yourself time and look beyond the Savile Row marketing to identify good individual tailors whose reputation is their brand, compared to going to the pedigree shops whose brand is their reputation, or at least too much of it. Second, focus on the things that benefit you rather than the public relations writers like James Sherwood. Many of these firms on Savile row have built their brands on things that don't benefit you, such as suits they made for movie stars 50 years ago, or royal warrants on the wall. That all makes for great publicity, but it doesn't mean you will get a good suit.After several attempts at MTM suits that never really fit me well, I recently decided to upgrade to bespoke suits. For my first attempt, I decided to go with Norton & Sons. I had previously visited several tailors on Savile Row (and a couple off the Row), and chose Norton & Sons, because I immediately liked their house style and enjoyed the initial conversation with Patrick Grant.
The quality of your suit will depend on the quality of the person you work with and how much pride they put in their work. Do your beat work on sites like this to find the names of those tailors and then interview them. There are many on this site who can give you good recommendations.
Lastly, the Savile Row system is an interesting but complex one where as many as 8 specialists have separate roles in the creation of the suit. This is supposed to lead to better workmanship through specialization, and I've seen evidence of this, but I think it can also lead to confusion, disruption and miscommunication along the way. A system like this can get out of hand if specialists are working from home and your garment is being shipped from here to there. You are better off with a firm that has all of that in-house, but probably even more important, has a very senior and strong cutter who commands respect from all of these workers so they submit their best work on time.