My experience playing games in Heroes of the Storm's genre is limited. I've played a few rounds of League of Legends. That's it. When I opened Heroes for the first time, I relied on my knowledge that ranged classes tend to be a safer choice for the inexperienced. In the opening week of the Heroes alpha, the ranged options available for free were Raynor, Gazlowe, and Falstad. The tutorial gave me a taste for Raynor, so I gave Falstad a shot -- a choice I do not regret. I've since tried all of the free characters and Falstad remains my favorite.
Falstad is labeled a Ranged Assassin. He isn't built to tank. He's built to get his licks in and keep moving.