What a disgrace.
Added 34 seconds later
It's just a bit difficult still; I haven't learned all the new cards yet. I thought that the 3-mana 2/2 unit with Bane would get Rush on Overflow, not Storm. I'm a bit upset.
Added 54 minutes later
Tox's armchair analysis of the first few days of the Arena.
Dragons are top-tier and overpowered. I won't even talk about it because it's just going to be a mess.
Blood is also stronger; I'd put them in the top tier. After all, they are one of the few that can break through a Dragon's shield in the Arena within the first 5 turns.
Swords - sorry, Erika, but I'm starting to lose faith in you. I haven't played with her yet, but I easily defeated all the Swords players with Dragons. Maybe she's good against Dragons, but I'd still put Dragons and Blood above her.
Shadow - they also seem to have become stronger and more interesting, but they get crushed by Dragons. However, they should play well against Blood and Swords, so they're tier-2.
Haven - I haven't seen them yet. I need to play one Arena match to see how Erissa is doing.
Forest, Rune - no comment. I think they've become even worse after the ban of Basic and Standard.