The F2P restrictions are rather light. No restrictions to content or game types (PvE/PvP/WvW) other than level. No restrictions to professions (class). No level cap. Chat and e-mail trade restrictions to combat RMT from using it. F2P can only buy proxy currency with real money vs in-game currency but they can convert the proxy currency into in-game currency.
https://help.guildwars2.com/entries/95982157-Account-types-Free-Core-HoTIt's a very casual game in PvE. Combat is action oriented, you can't face tank well.