It was not ideal against small manouverable fighters but had plenty of engine power and lots of missiles... add a gun and improve the missiles a bit and you have an excellent fighter/bomber.
It would be an OK interceptor, but not in the same game as the MiG-25.
Comments about the F-4 being used as a strike bomber are interesting... it reminded me of the old British Buccaneer... a carrier based plane that was derided as being subsonic, yet with a bucket of instant sunshine under each wing at low level if was faster than an F-16 and could fly further... and could do so from an aircraft carrier...