This book is so arcanely written that there are many guides written to explain what exactly they mean. I would not be suprised if some people have even written guides to the guides. While it contains most of what you would want to know about complicated electrical codes, some places don't use the NEC verbatim for their codes, so even if you do know the NEC backwards and forward (which no practicing electrician can afford the time to do) you still might not be en strict compliance to the building codes of a particular place.
Get one of the Guides to the NEC, there is even a graphic one with Ben Franklin as your narrator/mascot.
Dry reading, of course! It is a code book, what did you expect? However, there are a number of inconsistencies that cause trouble for those of us in the solar industry. Many should be fixed in the 2011 edition, but many were supposed to have been fixed in this edition. The code lags behind the technology, and we are always working backwards to stay compliant, while other countries move ahead.
This is more like a reference book for finalizing product specifications. Not that it matters, but it is written in a relatively easy to understand language.