The nook definitely supports bold text - I have books that use it.
However I have noticed format differences between some books on the nook and iphone reader, which leads me to believe that they are not using the same markup parser, and therefore some may have bugs when others do not. Also, B&N carries two different formats of each book in some cases, so it may be the case that one is wrong and the other is not. You should raise that issue with customer support giving them the specific example.
Not sure what "full reading" means, but my batter life is definitely better than two days with 1.3. Of course I am in airplane mode unless I am dowloading new content.
More/better font selection would definitely be nice, can't argue with that.