Is this a bug...?

five games in a row, all five of them my opponent opened with faeria tree… great!

Do you seriously think this is a bug, or are you inviting discussion about why it seems to you like Faeria Tree is overplayed?

I personally find Faeria Tree to be a below-average card; Triton Sanctuary offers more versatility in general and Faeria Tree makes you wait a long time and spend a lot of resources protecting it before offering a large spike of faeria that you might have a hard time using all of anyhow since you’re down an additional card.

Red damage (Firebomb, Groundshaker, Flame Spitter etc.), general Rush decks, and Slam creatures are all really good counters to it.