9) All games are easy to house rule; however, since D&D is "balanced" if you use what the core rules suggest, implementing house rules can cause unforseen effects.
I agree. The 3E rules have house rule repercussions more than former editions perhaps did. But arguably former editions lacked much game balance anyway, so the point is somewhat moot.
I was going to mention 3E being an exception to this one (you'll note a post I made earlier in this thread about the system's somewhat allergic reaction to houseruling compared to prior editions), along with an addendum to point (10) that 3E stat blocks have grown from prior editions to the extent that adventure preparation can take longer than it used to in statting out NPCs with feats, skills and other paraphernalia. This is counteracted somewhat by the CR system for monsters and traps, which takes some of the guesswork out of adventure creation, and creating characters for 3E is still somewhat faster than most skill systems (not that it is a pure skill system, more of a hybrid), so meh.