I found tactical view to be pretty useful except for when tackling elevation or a internal space and then it flat out fails but that can be remedied with patches. I am surprised it even passed QA and to me it shows that it was rush out the door and prolly not BioWares doing, it was quite obviously flawed and they knew it.
Regards 1% or 5% of the fights using tactical, what difficulty was you playing on 🙂 try it harder and then you will use it. Dragon fights and some mini boss fights its needed and I even used it on some trash fights to catch my breath. I must say also that the fast forward is a huge step in the right direction and if they can nail the camera issue then I think it will be much more used.
Edit: Yeah I agree with Fred. That outburst was unwarranted and everyone has the right to post their issues on this forum without being told basically that their issues are Not imortant. I too suffer with the performance issues in DA:I since patch 2 and I have given up playing but I did finish the game prior. I still come here to try to help and offer advice.