I find the Tom Vasel reviews quite interesting. He represents a whole different kind of player than you find in this forum, because he views it from the real life play perspective, which also influences his oppinion on some expansions.
I mean, he dislikes Alchemy, he's not that fond of Cornucopia (which is quite popular in the online community), and now he complains a bit about the confusion and the long turns Dark Ages creates. Well, i have the feeling he's completely right. Alchemy and Cornucopia can be quite annoying in real life (play Hunting Party, draw card, reveal hand, skip cards, draw one in hand, play Hunting Party, draw card, reveal hand .......), which is not a big thing at all online.
And Dark Ages WILL create confusion. Things that online implementations will track for you can be quite a headache in real life. Just look at the simple example in the rulebook and you might understand what I mean.