"What makes Snart such a wholly captivating villain is Wentworth Miller’s understanding of the show he’s on. He relishes the heightened nature of the character and world he’s a part of. He doesn’t merely say his lines, he devours them. Just listen to how Snart says his four rules, “Make the plan. Execute the plan. Expect the plan to go off the rails. Throw away the plan.” It’s glorious. He also understands that Barry didn’t just need him for his thievery skills. Barry wanted someone who wouldn’t stop him from crossing moral lines the way his friends normally do."
Great article from vulture.com