I think the chosen artist is pretty good, he has some very detailed backgrounds with a lot of people so that fits very well with a book about politics, and he also has some crazy magic stuff that fits with Loki and the tone of the book (which seems to have a lot of humor, even if things probably will get more serious as the book progresses)
About Civil War... I think that if Loki chooses a side (maybe he doesnīt choose any side, who know?) heīll chose Carolīs (Also thereīs the fact that Thor is with Iron man and we all know how Marvel works with this kind of things) the end goal being more important that the ways used looks like something heīll do and even if he doesnīt like the idea of being punnished for something that he has not done yet that doesnīt mean he canīt do something to make sure that the hypothetical future doesnīt happen, but itīs a tricky situation and I think that with a good reasoning he can fit in any side (or both...or none), maybe once more details are revealed about the Civil War plot it could be easy to put Loki in one of the sides.
But honestly I hope the series doesnīt start tied to an event, well... at least not completely tied so you feel the need of read the main event like JiM with Fear Itself (Even if after read both you realizes that the event is better if you only read the JiM tie in)