MartyParty & anrox335
in TE2013, there are way too many deep shots, and more importantly, there are very few normal deeply shots (ie: a bit after the service line), except when using the short strikes, and there are almost no really short strikes (ie: noticeably before the service line). So yes, overall, TE4 is much more realistic on the strike depth, and not only on the mean, but also on the distribution between around the line 1-meter before the baseline, as exposed in the mini-blog post linked before.
After, gameplay-wise, if there's a basic manual way to hit deep (eg: press a button, or put the stick up, etc.), then an unrealistic amount of shots will be too deep.
Lastly, in TE2013, except on strikes not prepared long enough, or when you're misplaced, there's no way to hit long ; so there, TE4 is already a bit better because overall there's a bit more chance to hit long (the main visible example is the return of serves of the IA, when returning difficult services).
Thus said, I tested a bit and indeed, the game could use a few deeper shots ; I think that long prepared strikes while standing on the baseline or a bit inside would be good candidates to get such kind of strikes...