I found this discussion over on the Tyranid Hive about GW 'logic' and found the part discussing the real life values of Toughness characteristics very interesting. It made lots of things make a lot more sense and some things make a whole lot less sense. It basically explains the toughness chart as an exponential increase with T6 being roughly equal to an AV10 vehicle.
Very interesting and though provoking.
*Note* This section of my blog seems to be getting ever-more elastic as I don't seem to be concentrating on what I originally intended, the fun, contradicting and interesting fluff of 40K. Do you find the direction this section is going good or boring? Please vote below.