When most people are complaining about the Rangers being "soft" they are mostly talking about the forwards.
And "soft" in this instance, in my opinion, has nothing to do with lack of heart. Zucc, Stepan, Hagelin all have heart. "Soft" In this context is about the ability to break through physical play in the slot and along the walls to make plays, and about the ability to win the physical war of attrition in the playoffs by consistently hitting and hitting hard.
With Asham likely gone, the Rangers have 3 forwards who you can argue contribute to that consistently. Callahan, Boyle, and Dorsett. Two of those guys are sub-200 lbs. The other you can argue doesn't do it consistently. That is an issue.
And it is a lot easier to get away with being "soft" when you have Toews, Kane, Hossa, Sharp, etc. in your top-6. Anyone think the Rangers are going to out-skate and out-create the other 15 teams in the East? I'm not holding my breath.