Actually, the RotCG/TTH crossover problems aren't too bad. I gather that Erikson didn't actually get a chance to read ICE's manuscript, so the two characters who cross over from RotCG to TTH really don't mention what they got up to just before this book. The biggest of the huge events in RotCG isn't mentioned in TTH (surprisingly, in fact) but another revelation does slip out which I think impacts on a RotCG storyline.
But overall, the issues with reading TTH before RotCG seem to be lot less pronounced than some of Erikson and ICE's statements suggested.