I think Oblivion's intimidation is caused by other factors. Dive Machines are colossal and Oblivion looks particually opressive.
Mumbo Jumbo isn't as bad as I expected, but I don't rate it either. It's not as fun as a Eurofighter because it feels too controlled and slow. It doesn't feel like a coaster and the elements aren't pleasant. I think that kind of ride would do brilliantly as an indoors coaster with extreme theming. I want Disney to get one.
Eurofighters are popular because they are cheap and extremely cheerful. As an enthusiast, I find it a real shame how rough they are. Saw is ...awful in the afternoon. Just awful. I can't think of many other coasters which are that painfully rough. In the morning, however, it's okay and I actually really like the indoors part of Saw. It just seems a shame that outside the effort was lagging, both in the ride's actual design and the themeing aspect.
Oblivion is only better because it's of a higher standard and quality to begin with. So any EF or, whatever Jumbo's type is called, has got to do a LOT before it can catch up. Mumbo doesn't even try, it's only the second of it's kind and it's just flaunting it's gimmick in hope that's enough when it's just not. Saw failed because needed a better considered layout and more interaction with it's theme.
These rides have the potential to be really good, but no one will take it upon themselves to show off what they are really capable of. And even then, I still doubt they'd better the likes of Griffon and Sheikra.