"There are only three old Boy George songs in the show, all come at the point where George is getting big (thus singing those songs). Everything else was written for the show. I agree with the person who said they don't really move the plot along though, that's pretty true."
I think the songs in Taboo work beautifully in context. They describe the thoughts and feelings of the characters at that moment in time. "Stranger in This World" is a beautiful and ethereal introduction to young Boy George....I think without it we would not develop the empathy for this character. "Love is a Question Mark" illustrates the love and devotion and yes, ambivalence of the individuals in each set of couples. It is an important moment in the story. If you look at each song carefully in it's moment, you will see it's relevance.
This will all be a lot easier to do, however, WHEN THE CAST RECORDING IS RELEASED. Only crazed multiple-returnees would remember enough of the show to make these observations.

In spite of the in-your-face costumes and subject matter (which is not all that threatening, regardless of what the general public thought) it is really a very subtle and beautiful piece.
That said, I know it doesn't have much hope of many nominations or wins, but I think the score is far stronger than Wicked, which I forget immediately DURING the show as it moved on to the next number. I expected to like Wicked the best of my "See-As-Many-Shows-As-I-Can-Week-In-NY" and I was terribly disappointed. The sets and effects were fabulous, I know the performers were great, but I just never connected with them because what was coming out of their mouths just did not engage me, pull me in.
I haven't seen Caroline, so I cannot comment, and I enjoyed Avenue Q, although I think the lyrics were more memorable than the score. I would be disappointed if they won over Taboo, but frankly I would be outraged if Wicked won over any of them.
So that is likely what will happen. I definitely dance to the beat of a different drummer......