Well, that's petty much what the Berkeley Earth Project did: started from scratch on the the data, took a fresh look at the statistical methods (and even managed to extend their data set back a bit further than had been done previously - which was a useful contribution)... and came up with almost exactly the same result as previous methods.
So you have to ask "How many bits of the apple is it reasonable to take", and expect to get a different result?
Perhaps you should try eating something else for a change. Land temps are horribly corrupted and significantly limited. This is primarily a water planet. Best to use sat temps of atmosphere and sea temps across depth. What apes think the temperature might be in their trees, is immaterial to the energy budget of the planet sun biosphere.
The BEST project made the data public. Skeptics have not had the chance to plow through the data.