The problem for Cleveland is that Boston has a "switch", too.  They've turned theirs on, and I think they're better than the Cavs (whether Cleveland is motivated or not).
If the Cavs are taking it easy on the Celts because they underestimated us, shame on them.  That doesn't make a lot of sense to me, since Boston always plays them close, but if they thought we'd be a walkover, the team is full of morons.