I also dislike the current combat system, but I absolutely loathed the legacy one. The truth is that I was never a fighter in legacy, that system was to difficult to me to aprehend. I have to admit also that PvP in Salem was more fun and rewarding to master. It was even more appealing to look at. Currently in HnH 1v1 spars are dull, boring and last forever or until one of them give up. They are even more boring to look at ...
I personally would love to see a Moba style combat, with timing and directioning of your moves being the most important factor. This deck system would work if the battles would be somehow instanced (like as soon as you get attacked you witch to an arena - see Duelyst). But then again, more poeple playing would be next to impossible, unless switched to dompletly turn based.