I agree with you that the 6set doesn't have any particular special brand or feeling, because its a stacking dot which make blizzard the only choice for mass wide application. That being said, its clearly epic in the overall damage it deals because its the only thing that can get wizards into deep GR's. Hopefully this will change with 2.2. I think what you are having trouble with is the play style, the set as we have agreed upon is pretty hands off and the fact that we are forced to use it in endgame could totally make people who don't like that play style feel bored, or lacking in interaction. I don't think the 6 set needs any changes and with the addition of the new 4set bonus there might be more of an epic feeling with mobs exploding in fire dmg, although its no more interactive then whats currently there.
whats desperately needed (for all classes) is OPTIONS, we need viable alternatives to further increase the choice of style that can compete with each other in endgame GR's. I by no means am a blizz fanboy but 2.2 is clearly a step in the right direction if they can balance the viability of the new sets. This problem right now isn't just with wizard either but with every class. I played a WD for a long time before getting into wizard for S2. The harvester set felt really interactive and unfortunately until 2.2 comes out your only option is to look at the endgames of each class and choose which seem the best for you. If you are sticking with wizard then your only friend right now will be patience. I personally only focus on one class per season so I can't wait for 2.2 unless 2.2 releases along with a new season in which case I will changing classes to try and keep the game fresh for me.