After the first day or so of voting, here are some numbers.
Top 10 Rated Cards of Un'Goro
- Jeweled Macaw
- Vilespine Slayer
- Kalimos, Primal Lord
- Arcanologist
- Fire Plume's Heart
- Crackling Razormaw
- Primordial Glyph
- Blazecaller
- Spiritsinger Umbra
- Tol'vir Stoneshaper
Jeweled Macaw at number 1? I mean, it's obviously good but being rated the best card in the set so far is a bit surprising. Fire Plume's Heart is rated the best Quest and I would agree. The one card on this list I could see being a huge miss is Spiritsinger Umbra. It's obviously a powerful effect, but I wonder how consistently you can get it off to make it worth a deck slot.
Bottom 10 Rated Cards of Un'Goro
- Explore Un'Goro
- Sabretooth Stalker
- Frozen Crusher
- Stormwatcher
- Sated Threshadon
- Humongous Razorleaf
- Molten Blade
- Stegodon
- Vinecleaver
- Sherazin, Corpse Flower
You can take it to the bank that all of these cards will see little to no play in constructed. It's generally much easier to rate bad cards than good ones and even if you are off by a little the card still likely won't see play. The only one on this list I think has a chance to make an appearance in competitive decks is Molten Blade. But probably not.
Top 10 Most Controversial Cards of Un'Goro
- Emerald Reaver
- Bittertide Hydra
- Primordial Drake
- Hallucination
- Lakkari Sacrifice
- Bright-Eyed Scout
- Biteweed
- Envenom Weapon
- Stampede
- Fire Plume Harbinger
These 10 cards have the highest variance, meaning the community is very split on how good or bad they can be. Bittertide Hydra is an expected inclusion, given the debate already here in the thread. Primordial Drake has had a huge range of votes. I would think an AOE plus Taunt would have made it no worse than a 3 but it's garnered a lot of 2s and even 1s. Envenom Weapon is another one where people are very split on whether it is super good or super bad. Keep an eye on this list after the set releases, most likely a couple of these cards will be sleepers. Finja and Dirty Rat were two from MSoG that landed on this list and went on to be very good cards.
Overall, my first impression of this set was it contained less OP cards and the votes support that. Literally none of the cards have garnered a median vote of 5 (meaning that most people voted a 5 for it). MSoG had 8 cards that scored a median of 5. In addition, the highest rated card of Un'Goro has only an average score of 4.17. That would only be good enough to land it at the 19th best card of MSoG.
On the flip side, there appears to be less absolute trash cards with only three Un'Goro cards getting a median score of 1, compared to seven from MSoG. So it seems that the power level of this set has been distributed more evenly, as opposed to having very clear tiers of cards.