I never said GT5 was a failure. And selling comparable to the latest version of Monster Hunter on Wii wouldn't make it a failure either. People considered MH3 to be a failure long after Capcom repeatedly told them they were happy with sales for consecutive quarters. I don't see an issue with comparing these two games.
And Monster Hunter IS huge - on PSP. Never had a major console presence - which is probably why Capcom was very still pleased with only just over 1 million sold (as opposed to MILLIONS sold for the handheld iterations).







