Welll. Ok I watched the Sopranos before I watched the GF trilogy and I love the Sopranos, that having been said it IS much fluffier but also more obviously and less stylishly violent then the GF movies.
I watched the Sopranos seasons 1-3 in one week, my husband and I watched it every waking minute for days on end in preperation for the 4th season starting and having watched them all so close together you can see the show evolving from crude to stylish from the first season to the second and then a lot more music began being used for the third season.
I agree, second season was the best and juciest overall. Fourth season seems stretched thin like they're drawing everyting out longer trying to make smaller plot lines more significant.