The IPCC -gates have so far mainly been a feature of Working Group 2, which looks at the potential impacts of climate change. As Hans von Storch explains in the introduction to a posting by Richard Tol, this is not because the other areas of the IPCC report deserve a clean bill of health.
The WG3 report did not attract the same scrutiny. This could create the impression that WG3 wrote a sound report. That impression would be false. Just as WG2 appears to have systematically overstated the negative impacts of climate change, WG3 appears to have systematically understated the negative impacts of greenhouse gas emission reduction.
Tol's article is a must-read.