As a fan personally, I don't mind them. I tend to really enjoy gimmick matches, I watch a lot of PPV's and just about every weekly show the WWE produces, so for me, they're great. But I am able to look at it objectively and see the rationale behind why people don't like them, and why they largely, beyond Elimination Chamber, haven't succeeded.
A big, big allure of gimmick matches is that they're out of the ordinary, you generally aren't expecting them. When they do come along, it's usually because a feud calls for it. A rivalry has become so big and so heated that it can't be solved or finished by a regular, everyday match. Hell in a Cell is the big one here for this. So when you take a match like that and now schedule it once per year (although HIAC at Wrestlemania clearly proved the WWE is willing to be flexible on that front when they need to be), a big part of the magic is gone. The WWE really, REALLY hurt the prestige of HIAC over the last few years because they took standard, everyday feuds that had no need for a HIAC climax at all and had them have it. That weakens the match.
Money in the Bank and Elimination Chamber are different because they've always been their own PPV-exclusive thing. Money in the Bank was established a Wrestlemania exclusive event (which is how I thought it should have stayed), and as such it wasn't a big leap for it to expand into its own PPV. Elimination Chamber is similar. Plus, both match types have six-plus guys in them.
BQ: When a wrestler takes a huge bump and the referee rushes to their side and makes no show about checking to see if they're alright. They cup the ear and get in tight. A lot of times when they're are holds on the mat, it's used both to give the wrestlers a break and to communicate the next sequence of moves.