There aren't as many STEEL-FRAMED guns out there, nowadays, as once was the case. A surprising number of the non-polymer framed guns have aluminum frames, which are noticeably lighter. Many of the metal-framed SIGs and Berettas are aluminum, not steel.
I'm happy with polymer, steel, or aluminum -- but it depends entirely on the gun and how it is to be used. I typically don't carry a steel-framed gun, as the extra weight gets noticed as the day wears on. That said, I pay more attention to the "action type" than frame construction: striker-fired, hammer fired, and whether the action has a safety or decocker, is DAO, SAO, DA/SA or a hybrid, like the Modified Double Action (used in some striker-fired guns, and some of the metal-framed Third Gen S&Ws) which requires slide movement to partially power the action.