She’s ok, but they could have easily done better with in-house talent. Guilfoyle comes to mind for one.
MacCallum has been given the job on a trial-run basis; if the ratings hold, she’ll get the slot permanently. If not, look for Kimberly Guilfoyle, Jeanine Pirro or even Shannon Bream to get a shot.
Fox has a deep bench. Eventually, one of them will compete with Megyn Kelly, who will be demoted to MSNBC after her daytime talk show and Sunday magazine flop.