I think bot should throw away 4 drops in mulligan. He keeps that 4 drops and it slows him down many times.
The deck you use for the bot has to have a relatively good bell curve. Usually with human players, you can compensate for a bad spread by mulliganing specific cards and also playing coin/cards strategically. The bot does not take this aspect into account and thus plays your best option not thinking about what it can do the turn after. Therefore your spread has to be really good or else you'll be stuck with turns where it will just hero ability (which is a waste). Therefore if you are being slowed down by just 4 drops, your deck should be reworked.
I'll give an example of a bad play that a bot made, that a human wouldn't in regards to future turns:
-I have in hand a leper gnome (1 cost), frostwolf grunt (2 cost), harvest golem (3 cost), boulderfist ogre (6 cost), and coin
-turn 1 (going second) the bot drops coin and the 2 drop (which sometimes can be good, but in this case, no)
-turn 2 it didn't draw a 2 cost, and therefore now has to drop the leper gnome and end turn. (wasting our 1 mana crystal)
This is terrible, because a leper gnome is a 2/1 and therefore is a very good first drop, dropping a 2/2 over it makes zero sense, unless the other class is a mage (we want rogues/druid to face it most of the time, so it doesn't matter if they waste their turn 2 hitting it). ALSO in this case, it is also the better drop vs. a mage because the mage will be forced to ping it turn 2, and thus waste their turn to remove our 2/1 while still taking 2 damage. NEXT turn is where it's great for us, because turn 2 we drop the coin and bring out a harvest golem, now we're ahead quite a bit.
The way the bot does it, wastes our coin for a CHANCE at 2 damage (which would be have been guaranteed by our leper gnome anyway), and makes our turn 2 a waste. If it were played the other way, our mana would have been used efficiently, and we would also have greater board presence.
Sorry for the convoluted reply, but this is also a bot behavior I would like to report in this thread.