When I play most of regular quests, I build in a large box of choices, strategies and stuff.
If I want to play and win riddle quest or something like this, I'm forced to build in a little-little box with almost no choices to it, compared to regular.
That's the difference. I like to build my decks for myself rather than quest building them for me.
P.S.: What makes it even worse, the riddle quest is a part of campaign. Being forced to completely rebuild your deck from scratch in the middle of a campaign is a bit of ball-kicker.
Edited by MyNeighbourTrololo