Coming from Ipad I find this really bad on the Nexus. I'm constantly correcting everything I type as it either misses or adds random characters everywhere.
I took mine back last week because of this (posted earlier in the thread about it). Just google "Nexus 7 2013 touch problems" and loads of people have a problem due to the cheap digitiser they use.
A mate also returned his one too from a different batch as it had the same problem.
Samsung devices don't appear to have this problem.