Sorry to intrude Davek, but it appears to me that the only way you will 'like' Koeman is if the team score for fun every week and play like barcelona, but i have noticed you in the past for rubbishing the idea of Koeman managing Barcelona.
No manager in the world plays to the level you seem to expect from Koeman to deliver, even some of the best have bad spells or games where they grind a result out because they other team has learned how to play against them. the only comparable i can see from your viewpoint is that you compare our team with ones filled with the best players in the world and as good as some of them may be, they are not messi/ronaldo/muller level of players. These players cost great amounts of money to sign, so it is almost like Koeman on the whole is always going to fail in your mind unless he achieves something we have not since 1987, and win a league title.
for what it is worth, Koeman has had to manage a squad a players into his way of doing things and at first it didn't work as well, but since it sunk in we have seen our results improve quite a bit. Being negative to the manager so early on is a little bit short sighted i think, until he has had 2 seasons in charge we cannot really see his imprint in the team.