I personally find them pretty dull, but even if they're not the best Pokmon cards, they do get bragging points for one thing - their scarcity
Aang, Airbending Master Allied Teamwork Appa, Steadfast Guardian Captain's Claws Gather the White Lotus Gideon, Ally of Zendikar Hook Swords Invasion Reinforcements Iroh, Tea Master Jasmine Dragon Tea Shop Katara, Water Tribe's Hope Kyoshi Battle Fan Kyoshi Warriors Loyal Fire Sage Match the Odds Path to Redemption Pretending Poxbearers Retreat to Emeria Sokka and Suki Sokka, Tenacious Tactician Suki, Courageous Rescuer Suki, Kyoshi Warrior Sun Warriors Tolls of War Treetop Freedom Fighters Unified Front
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With only 80 HP and its sole attack being Rolling Tackle (causes 40 damage), it doesn't make sense to have it in any balanced deck
The higher the grade, the more likely it is that other collectors will pay a premium to own it