Ok, duels imo is the fastest and best way to know your opponents, and its fun too. Not good against a class? Duel until you learn a lot of them and even learn about different uses of your own skills. This may be posted again, I dunno, but blizzard never made any changes in how duels works overall.
I mean, a "clean cd" future right before the duel starts (like in arenas) will be awesome, alloying ppl duel without w8ing 3-4-5 minutes for their cds. To avoid exploits, you can let real cds clocking in the background, and after the duel is finished the timers will return to their original non-duel state.
There are many interesting duels happening out there, and ppl want to watch them. I believe that an "duel observer mode" will be awesome, alloying you to watch their hp bars, cast bars, or even navigate your "camera" near the heart of the action without annoying them with your presence.
What you say?