Yeah, I tested a lot of different builds with a shifter having the same concern. They are a blast to RP - you have to put a lot of thought into how you build them to be effective at dungeoning in higher levels, but it can be done. I have a few melee characters and my shifter is the strongest.
I don't believe there is a complete list of the changes to the class. The most important ones are that the AB of the class has increased to +1, skill bonus equipment now stacks on the creature skin (but does not combine with bonuses given by various forms), and some additional skills were made in-class. Wyrmling form receives a bonus to detection vs true seeing, but there are no other changes to the core forms.