Don't try and make out like this is an objective problem, it's all down to personal tastes on how you like the controls to be.
For each individual, yes, it's personal taste. On the large scale there are proven ways of doing things - Software Ergonomy, Human Computer Interaction and User Interface Design deal with these problems and there are parameters to objectively evaluate usability.
Wouldn't you be irritated if the manufacturer of your speakers decided that counter-clockwise turning of the volume control for higher volume was a good idea? It's functional. It's nearly identical to clockwise control. And yet I dare say that 9 out of 10 people will curse the manufacturer for it.
There are things we're used to (like the clockwise turning for an increase - at least since the first clocks), there are analogies (like the volume buttons on a remote - up for higher, because if you go up somewhere, you'll be higher up) and several other effects and these need to be exploited for good usability.
Would agree with you on the "ruining the game" thing though. The shortcomings don't sound THAT drastic - without ever having laid my hands on the game. But still, especially the tactical camera I can picture myself go mad about and it will probably significantly diminish my enjoyment of the game. So I can totally understand complaints - how extreme those complaints are, is just your everyday internet communication, sadly.
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And to be honest, you're really on the minority if you don't like free mouse look in 3D games. A shooter for example would be almost unplayable without free mouse look. Just imagine CoD or Battlefield or even a third person shooter without free mouse look. Come on, there simply is a reason why stuff like that got standard in the world of PC controls. It's because most people acknowleged these control pattern to be the most functional and "best" ones. Could you at least explain to me why you don't like free mouse look. What does it take away from you or how does it interfere with your experience in a game like DA Inquisition? I honestly don't get it how somebody could seriously be again free mouse look in such a game...
At least concerning this particular point, I'm with @
Princess_Ciri , or might be, if DAI is anything like Origins. Because first and foremost, for me it's a party-based tactical RPG. I don't just shoot or hit, I navigate the battlefield, mark targets and issue orders, and that for multiple party members - or in other words I control indirectly - and for that I want to use my mouse pointer, not a rotation of the camera (the shortcoming of the tactical camera, by the way, fixing the cursor to the center of the screen). Therefore, there is both a tradition within the series (consistency) and a good reason for not rotating the camera per default with no button press (although that really depends on the amount of exploration and camera rotating vs issuing orders you do throughout the game).
If my comment doesn't apply to DAI at all, because it's radically different, just ignore me.