In my opinion, why Modern Soul Sisters is considered a "Bad Deck".
When soul sisters wins, it wins from gaining life to try to make the absence of removal irrelevant. To put enough early pressure and go ahead for the win. We play cards like Ranger of Eos and Squadron Hawk to fill our hand with creatures and to keep putting down threats even after we get board wiped. We try to ignore what our opponent is doing and stick to what we do best. Gaining life and beating down. When we run into the predicament where attacking with any of our creatures is no longer relevant is where we struggle. Our opponent drops down a huge creature and our attacks would just die is where we need that Path to Exile, if we don't get it we are pretty much screwed.
Trying to avoid or fix this problem is where the deck really struggles. We can't deviate from our main game plan, because it will seriously hurt the decks tempo. The decks is so unreliable when it comes to dealing with our opponents threats that those threats soon outclass ours. The problem grows as the game reaches turns 3-4. If you can get enough early pressure on the board to overcome their plays, good for you. It isn't necessarily hard for the deck to do. However, That certain fact of uncertainly is the glaring weakness of the deck.
Also side boarding out cards feels like it's setting us back more than helping. But I do feel like we have enough SB options to cover alot of our bases in the bad matchups.
But I do feel Soul sisters a good deck to evolve into something a bit more sophisticated, like Martyr Proc, BW tokens, and other decks like that. Decks that have hand disruption, removal, and card advantage as well as serious finishers.