Dunno what these reviews were trying to convey, but it sounds .....
'awkward' .... to say the least(and that's just trying to keep the discussion family friendly!
)
Both 7D and D7100 are both very good focusing cameras, and
shutter speed will be as close to what the rated speeds could hope to be.
Anyhow, if it were a choice of 7D or D7100, D7100 is the newer camera with a few advantages up it's sleeve.
The only real problem with ultra high resolution cameras, such as the D7100 (and I suppose to a slightly lesser degree the 7D too tho) is the need for good
lenses and technique.
D7100 should serve you well for a while to come.