I actually preferred the quirkiness of the old alignment. I thought it was pretty awesome to have rivalries with teams from different parts of the country. Plus a team like Dallas have those sort of traditional, non-regional rivalries, so it's not like they totally went away. The Patriots' dynasty sure would have looked a lot different if they were going toe-to-toe with Peyton Manning for division title honors every year instead of the trash QBs they faced every year in the new "East."
Another underrated thing I didn't like about realignment is I thought it kind of inadvertently diluted the playoff field. Prior to realignment, and I did this research awhile back and my memory is fuzzy, but I think there was literally only one single digit win division winner since the league went to 16 games, and now, it is pretty much an annual occurrence. I also liked how under the old alignment, the best wild card team hosted a playoff game. But now, with this mess we have, the best wild card team is on the road and many times they're playing against a far inferior division winner record-wise.
But oh well, we have what we have.