As a shaman lover, there are a few really obvious reasons why it failed so hard even with TGT power cards. I would say the Overload is actually a small part of the problem.
1) Blizzard underestimated the deathrattle-summoning minions, especially Piloted Shredder. There is literally no card that punishes you for playing deathrattle minions. Silencing deathrattle minions often costs you tempo, and Lil' Exorcist never works. If deathrattle-summoning minions are easier to clear especially with other minions, shaman wouldn't have such a huge problem.
2) Shaman is the only class with ONLY ONE UNRELIABLE BOARD CLEARING SPELL. Elemental Destruction is a joke, it is as viable as Twisting Nether, if not Lightbomb, since it costs you tempo and your board. It is not comparable to Flamestrike at all. Every other class has at least 2 viable board clearing spells, but why not shaman?
3) Lava Shock doesn't work. Honestly, it should have cost 0 and does no damage other than the mana-lock clearing effect. It should have been a tempo card, but costing 2 mana makes it doing the opposite instead.
4) I've told people Healing Wave is way worse than Vitality Totem and Antique Healbot when it was announced. Why? Because shaman need ANY-BODY on the board in order to NOT LOSE immediately, and Healing Wave doesn't provide either a body on the board or a substantial amount of reliable heal.
5) While Thunder Bluff Valiant is really strong, Mukla's Champion is actually a better substitute in almost all cases. If you played enough games, you will know that Mukla's Champion can sometimes turn the game into your favor, but not Thunder Bluff Valiant. Your totems almost always doesn't trade + survive, and +1/+1 makes you way better against Consecration and Holy Nova than +2/+0.
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Moreover, this big dude might be strong but not fun to play at all.
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Vilespine Slayer
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Compared to mage 554, you could choose which card to be used to destroy the casting minion, that's awesome!
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OR change Lava shock into 0 mana magic card: No overloading next turn.
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http://www.hearthpwn.com/decks/346228-top-3-eu-legend-mryaguts-bloodlust-shaman
Yup, this deck restores some of my hope on Shaman. The disappearance of Patron warrior should make this deck better.
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This combo is quite sick as there are no good counter to a 4 health minion in their T2/T3, for Warrior they have to wait T4 to play Death's Bite/ Shield Slam and I doubt warlock nowadays will playSoulfire
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Undertaker got nerfed.
Patron is a late game combo stuff
But secret paladin can keep giving pressure and in T6 one MC could guarantee the tide. (unless you're playing flare)
Clear huh?
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Seriously?
1.Your minion attacked, Noble Sacrifice Redemption comes in,Avenge buffed another minion (Defenderfor example) you can't BGH MC
2. MC got buffed and you BGH it, Repentance comes in and it revives as 61
Mindblown.
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Or maybe what you need is
Baron Geddon