Except that "one" game is completely unplayable on the AMD chip. That's the problem.
Yet,there are plenty which are not very playable on Intel chips too. So basically its a case of cherry picking one game which might not run well on an AMD IGP,but then ignore all the ones which run sub-par on Intel ones,especially when even via Anandtech's own reviews of the Haswell IGPs,showed the Core i3 equivalents with the same IGPs were running worse than the Core i7 equivalents.
Edit to Post.
You talk about minimums - look at the graphs in other games from another poster.
The Intel chips are having really poor minimums in those games.
Also,the Anandtech review shows a big problem too:
http://www.anandtech.com/show/9483/intel-skylake-review-6700k-6600k-ddr4-ddr3-ipc-6th-generation/20
Look at the scores for the Core i7 4770 and Core i3 4330.
Both have the same HD4600 IGP with the latter having around an 8% reduction in peak clockspeed IIRC.
However,the actual reduction in performance is between 20% to 30% which is big.
I expect the Core i3 6100 to be a decent amount slower than the Core i7 6700 in the IGP tests if it follows the same trend.
Plus the Anandtech review is still showing the A8 IGPs to be quicker than the one in the Core i7 6700.
The worst thing is Grid:Autosport.
Grid 2 and Grid:Autosport are Intel sponsored and even have their CMAA tech in the games.
The Core i3 6100 is going to be slower too than a Core i7 6700. The performance increase is massive with the AMD chips,and that's only looklng at the A8 chips due to the price.