I bought LOE and BRM. I have a decent sized collection but can't play the expensive decks. I've actually gotten pretty lucky with my legendaries...only crafted Dr. 7 and Twin Emps. Will probably craft Rag quite soon though since he's never going away.
Playable legends I've opened: Leeroy, Sylvannas, Malygos, Xaril, Jaraxxus, Al'akir, Paletress, Hogger, Rag (TOG), and Gormok....so yea pretty fucking lucky.
Honestly, there are some really inexpensive decks out there that require a handful of rares and epics that are extremely strong. F2P is definitely possible if you're good enough.