He's wouldn't have been my 1st choice but there again who's to say he was the boards first choice? None of us are privy to the negotiations that have been going on between Everton, agents and targets so Koeman may well be the best choice available - it's difficult to absolutely know one way or the other.
What I do know is that we now (it seems) have a manager who is very well known throughout Europe with a reputation as a top level player behind him. And we have a manager who despite having a mixed track record at various clubs has also dealt successfully with the pressure of being favourites and getting over the finish line. Something we've not had in a long time and a change from perennial plucky underdogs such as Joe Royle at Oldham, Martinez at Wigan and ahem....Mike Walker.
There's always an element of risk with a new manager. Can you imagine the fume if we'd got shut of Martinez a year earlier and gone for 64 year old Claudio "Faroe Islands" Ranieri?