This is harsher criticism but as a recent lifetime subscriber, the auto builder is pretty bad, it builds particularly awful aggro decks that consist of only basic cards. The filter option doesn't do much because "include one card from" doesn't make a good or bad deck, and neither does "include a legendary" - there's an option to "must include card" but this is much less useful than simply "Never include card" which would be the most helpful as I could get it to not build decks with shit cards.
My opinion as constructive criticism, take out the "must include card" option, it's pretty worthless because for each type of deck there are different "must have" cards, control needs sludge belcher, aggro needs abusive sergeant but neither needs both. Having an actual "filter" to remove cards you know you don't want (crap basics like novice engineer, boulderfist ogre) is going to be useful in all decks instead of some, and to at least give me an auto-build deck that I can further tweak.
