In response to criticisms from Gavin Schmidt, Craig Loehle and J Huston McCulloch have published a correction to Loehle’s temperature reconstruction that uses 18 non-tree ring proxies. The pdf of original paper and the correction can be found here.
The corrected Figure 2 can be seen below:
The MWP and LIA remain prominent, in contrast to ‘Hockey Stick’ style reconstructions. However, in terms of reconstructions involving tree rings, as Steve McIntyre points out, if Yamal instead of Polar Urals update are used, you can get Modern Warm Period higher than MWP and vice versa; similarly with Indigirka versus bristlecones; or depending on Mann PC1 bristlecones versus Ababneh bristlecones.
In short, the jury is still out on whether the MWP had a global influence or if it was warmer than the Modern Warm Period. Nevertheless, the Loehle reconstruction makes a valuable contribution to the debate and should be included in the IPCC spaghetti graph that replaced the Mann et al Hockey Stick in AR4.