I choose Roger this time - partly because I believe he is actually a really good player even without any cheating, but mostly because of the decks he brought.
I mean it's usually the same over and over - looks like control warrior + rogue + zoo lock is the safest bet for most players, nothing that much new. 2 most interesting decks for me will be Roger's Paladin and Hunter deck (even though he gets my minus points for that stupid Baleful Banker + Elisiana, but I guess if you want to actually win, it might be necessary evil)
3
Im fine with a "fun" single player mode. but they should add random loot throughout. if you beat a certain random boss get a card back. If you beat a specific boss with a certain hero get a new emote. make it things that arent game breaking but still a reason to dip your toe in there every once in a while.