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Yeah, Grimm patron deck is awesome.
Though, i do find it hard to have some board presence in early game.
Hence, soaking up too much damage, and not dealing enough dmg to opponent.
Also struggle to have enough card draw in order to have both warsong comm and patron at hand.
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Its depending on what type of decks are you facing, usually against face decks you would want to mulligan for armorsmith x 2 + ghoul/indirect damage to avoid taking too much face damage.
Against zoo deck/mid range/control , death bite + patron is usually a good start.
Against handlock, try mulligan for execute.
I think the key is not playing around only on warsong commander + patron as turn 4 death bite hit something + turn 5 patron + death's bite deathrattle + coin + whirwind is a strong play by itself. Commander also combo with frothing, so the win condition may not be only locked to commander+patron.
After getting hit by a face for 5 continuous streak of face hunter, I learned that mulligan for weapons may not be the best idea because you will taking a lot of face damage in exchange of board control which is the wrong way to play against a face hunter.