Only some clarifications:
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But, seriously, what do you consider useful?
I am developing a game now and the most useful are the most harsh, blunt and concise criticisms - even broad subjective ones like "I hated this feature". Finding the solution is my problem as a developer and not the tester's.
Sometimes it is cool to get an explanation why the feature did not work and we do appreciate suggestions, but the former is not difficult to infer and the later has little chance to be implemented in most cases due to several practical reasons.
2) Proud of? Hardly, but you had this tone like TW3 had almost no problems with Day One, like it was superior to DA:I or any other game. I was pointing out that the Day One issues happen across all games. I'll take that as tone lost over text and I know I probably misunderstood your e-tone here. Again, I'm ill so I do sincerely apologize. 
3) I've been reading a lot of folks going, "Well, there is only some issues," in regards to DA:I as well. For as many FPS and crashing problems, I've read even more people state that there game is just fine. Performance issues are about bugs. It isn't just about FPS drops. For TW3, what about the people that are trying to access menus and freezing? Does that not count as a bug that affects performance? Or the folks that are needing large workarounds just like they did for DA:I? Do you mean the FPS problems that I barely even noticed after Patch 2? Also, I've had to turn off Origin overlay with other games as well. I had to turn off the Steam overlay for the TW: Ultimate Edition and I have a damned good computer. I'm betting if I looked right now, there would be folks with similar issues in TW3. That reddit thread is very active.
7) How is the Witcher's combat that much more involved? I've played many MMOs in my past, and I didn't see the combat as watered down at all in DA:I. See, this is what I mean. You're telling me how good something is without giving me details. Also, what is a "dumb" mode? So far, you're literally (I don't use that word lightly) one of the very few on the forums that has complained that the combat didn't have an easier mode. If anything, I've kept reading, "Stop dumbing down combat, DA devs!" I found the combat very easy and fluid, more so than Origins (with that stupid shuffle and bloated skill trees) or DA2. I'm not trying to give you a hard time, I promise. It's just an unusual request for the BSN.
8) Disagreed 100%. I found myself on normal having to carefully balance my upgrades and I enjoyed it. It was fun experimenting with different fade-touched stats, and I used it for way way more than just dragons. I would have several arms and legs before the game was done both times I finished it.
9) Okay, again, give me an example. It could be in spoiler tags, if you don't want to give anything away from folks in the middle of the game. I could name a lot of foreshadowing in DA:I from several companions and NPCs. I've been paying careful attention and the majority of those "fetch quests" are Requisition missions. If anyone thinks they are too much, then stop doing them. If you mean the Dalish, then you can skip that quest. I haven't seen very many required fetch quests, and I've been watching for them in my last two plays of DA:I (and I'm watching it on my third.) What do you mean that, "The Witcher feels like something is happening." You're not giving me an example here, and that's what I'm asking for.
10) "X feature is so much better," isn't a good suggestion either. It doesn't lend itself to any real ideas for what the devs can do. When I see someone spouting constant amounts of praise without context, I'm instantly more leery of their stances. You did just give a great example of what the devs could do differently next time.
11) I have no idea why that's the case there. I found the crafting system and the related numbers pretty clear to follow. Would you be willing to elaborate further?
12) Am I the only PC user that didn't think BioWare was lying or deceiving us much past the crappy PC controls? That's subjective and I know it's an unpopular opinion. Not all PC users can agree here..
What do I find useful in this case? If someone is going to compare one game with another, and wants to highlight what one company does better than the other, they need to provide examples. An example of a quest style/story (like the children crying over a dead body,) or more dynamic gameplay (such as a day night cycle.) If the menu is better, then I'd like to see some examples of it. I have no problem with someone going, "I hate X feature," but in a game comparison thread, that tells me nothing. Same with, "Well, I love X feature." Why do you love it? What about that feature is compelling?
From my own experiences directly talking to BW developers (one of which I worked with testing the party banter bug,) the loud and the angry fans stating, "I hate this," is payed attention to as much as the polite fans are. However, they appreciate some stated examples for comparisons. If someone prefers something TW3 over DA:I, that's awesome. I'd just like to hear why, especially if they think it could benefit my favorite RPG series.
I do want to say thank you for elaborating more on your points. That's the kind of feedback and suggestions I like to read. 