I've ready this topic for a while now, since the 1st LOTR wave.. And it's sad that what mande me decide to register into this forum were the (probably) last sets of what is my favorite theme..
Well, that said, I understand all the hate of the minifigs choices (I'm too disappointed, I still can't believe we didn't get Bolg, as I don't understand why there-'s no Faramir or Eowyn on LOTR), but MAYBE Lego didn't have the choice if they decided to follow the movie.. Let's see:
1. Battle of 5 armies: we all know why Thorin and Dain are here. The reason why we got Azog instead of Bolg is that PJ probably will put him against Thorin during the fight. And, perhaps, Beorn won't take part in the battle too (I still wonder why they put him in the Dol Guldur set).. Also, Thranduil probably stands away from the battle, giving commands, and that's why we get Legolas instead of him.. Bard is an important character and seems to take a nice role during the battle (as we see in the movie all the elves standing there with him)..
2. Lake Town set: we HAD to get Bard (and, perhaps, in the movie he doesn't wear full armour in that scene, because he was in the jail minutes before the attack and did't have time to prepare himself). His son is also important, because if I remeber correctly he is the one with the black arrow, and Tauriel plays a important role the story, althouth not in that particulary scene..
3. Wicht King: perfect set, I just don't know what I'm going to do with Galadriel if I buy more than one (5 Nazgul in that form is cool, and Elrond can be easily turned into a soldier)..