I know Thalnos is a good card, but it somehow feels wrong to spend the 1600 dust that I painfully accumulated over the last months on a 2 mana 1/1.
It depends on how much you use damage spells. It's a 2 mana +1 spell damage pump up that also draws a card. It's a card that can easily fit into most decks.
But, yeah, it's one of the least exciting legendaries. Hard to get excited about a 1/1 with limited upside.