I could picture that DME/MB/FP+ is more popular than the old FP system, and also has a higher approval rating (though 90% seems rather high).
This is another case where the folks on these boards continue to think that they represent the "typical" park-goer. IF that was the case, then I think the approval levels would be lower. (Though I think they are around 50-50 here on the boards, a lot of people even here like it, and I am amongst those that prefer the new to the old, though there are things I liked better about the old.)
The "OLD" system (FP) was poorly explained and not used by a LOT of visitors - I can't tell you how many people we ran into over the years that thought it was some sort of "pay as you go" system.
Disney is spending a considerable amount to explain to the average park goer how to use DME. I think a LOT more people are using it. (Why the Standy lines have actually grown bigger in some cases.)
Think about it, if you are Joe Schmo and you were expecting to go to Disney and stand in long lines, and were instead told "Hey look, you can book this ride and NOT stand in line, you just need to come back between 2 and 3 PM?", well, that would look great to you, wouldn't it??
For those of us that knew you could have done it all along, only now you HAVE to come back in that window instead of anytime after the start - it's not so great.
Where I do agree with LOL is that the implementation of this program has taken too much away from park improvements, so we are left with 3 parks desparate in need of expansion/new rides. DME is a good substitute for new rides for the business, and possibly even for the infrequent visitor (which is the majority) but not for the frequent visitor...
...I think this is a big reason they haven't pushed DME on DLR. Those parks have the opposite market of WDW. While WDW is probably 80% occasional visitor (and by occasional I say no more than every 2-3 years), DLR is probably 80% frequent visitor. Spending a bunch of money to try and force a new system on those folks wouldn't be as successful. (IT still will likely happen at some point, though.)