I'm currently somewhere at the half-point of the season 2. Having never read the books, I'm quite ok with it. There is a hint of a sense that they re-arranged quite a lot of parts, but having no burden of 'the right way' (as depicted in the books) I can let it slide and just enjoy the show.
I'm only so very slightly allergic to rearrangements (if done tastefully which is, IMHO, not the case here), but my biggest gripe is that they lost the whole spirit of the book(s) and made it into a syrupy FX action flick, where even the cultural accents quite masterfully daubed in the books (Yakuza/Japanese, Takeshi's eastern-European half, the whole deCom subculture, etc) are very much bunched in one mauve spot.