I have mixed feelings about Anduin. For starts he has grown up to be more than just a mere Priest and any King who fights on the front lines with his men is alright in my books. He is doing the best he can with the scenario he has been brutally thrown into. He gives the Alliance a goal and keeps all the Races in the Alliance as one, something Sylvannas is failing to do in many ways. On the other hand Anduin’s tactical mindset is not all there yet as Lintsehsu said above, he sent the Alliance to attack the Forsaken Capital and had no plan to combat the Plauge and Blight which the Forsaken has deploying for years now, he thinks that attacking the Zandalari and forcing the Horde to fight side by side will break their ties which is just foolish and in fact the way Sylvannas is she would have probably attacked the Zanadalari at one point or another.
Now my RP main Darnor is all for the Alliance Boy King Anduin and will fight in his service until the very bitter end. Darnor feels he is a Paladin spreading the Virtues of the Holy Light , leading his people to a glorious better future. A future were the Forsaken and the rest of the savage Horde has met Justice for their many misdeeds. Where the Alliance Banner is hung over Lordaeron once more and Azeroth is finally peaceful.