Games are about gameplay, hence why they are games. The cut scenes, cinematics, and storylines are all guests there, which can improve the quality (vastly) but are not what defines the medium in any way.
The problem with "Hepler Mode" is that it defeats the purpose of playing a game at all, if your just looking at an endless sequence of cut scenes, then you might as well just go watch an animated movie... and the newest "Pixar" feature isn't going to cost you $60.
What's more the entire attitude represents a lot of what is wrong with the gaming industry right now, with games becoming increasingly linear, and dumbed down, while the cinematics and graphics continue to get better. People looked at things like "Final Fantasy XIII" and a lot of the criticisms were pretty much that if they wanted to make a game like that the should have just made "Advent Children II" and dropped the pretensions of it being a game at all.
Simply put Hepler represents the cancer in the gaming industry right now, and while people say she's "just a writer" she is someone who is part of the design process, and apparently important enough to be able to speak for the company publically. She made those comments a while ago, but when you see the direction Bioware went in, it's not surprising there is a lot of ire, since a lack of reaction was probably seen as approval by the community at large.
The industry is doubtlessly upset about this, because honestly this backlash is them hearing exactly what they don't want to hear. "Hepler mode" and focusing primarily on story and cinematics is how they would prefer to develop games because it's easier and probably less expensive than developing and refining actual gameplay and mechanics.
It's sort of like the bane of the PnP RPG market, writing the stories and metaplots, and developing entire game worlds, is comparitively easier than coming up with a set of good mechanics. Many games have died because they took the whole "story trumps mechanics" bit too seriously and then wound up with a bunch of what amounted to $30 novellas and guidebooks to places that don't exist, with very little gamers could actually do with them. The classic RPG credo is "a good system can be used for any setting, a good setting is never going to be as good as one you create yourself" and people tended to forget about that and well... dozens of small press dreamers now fill the RPG graveyards of the world, while those that actually have enduring mechanics systems (no matter how you criticize them) like D&D and Palladium continue to dominate, despite people saying "I like this world" or "I feel this set of mechanics are better for this".
The point here being that the heart of a game is the gameplay, something like "Baldur's Gate" never would have worked just based on the story, it was the infinity engine, and the way that it played that kept people coming back for more, and that engine was also recycled into other games which became successful because it worked as an avenue for playing those stories.
I'll also say that there is such a thing as earning your progress, patience is part of that. If you think that the game is screwing with you by having thousands of monsters between you and the next plot point, you know... having to earn your victory, it's probably intentional. That's part of the game. Being able to "Hepler" your way through it defeats the purpose and gives you your reward (the next cinematic/plot point) when you didn't earn it. Part of the point to beating a game is that sometimes players aren't going to be able to proceed, or otherwise burn out, that's "losing" so to speak. All those games you stuck with and beat? They are ones you won, as opposed to those you didn't finish.
Basically the industry needs to kick Hepler to the curb, her continued existance in this business is a sign that the industry doesn't care about the gamers, like it or not she's become the focus of some major gaming issues which admittedly go beyond her, even if she represents part of it. It would be an assurance that the gaming industry is at least taking the gamers seriously. I mean I DO hate to say it, but writer or not, she really has no place in the industry right now. Maybe she can get a job writing books, or doing screeplays or something that doesn't involve gameplay that better fits her ideals.