There are several issues with the standard, under-center triple option. For starters, the B-back (fullback) does not run the right track. In NCAA 27 his path is ran between the center and guard. To make matters worse, the blocking assignments in the A (and B-gaps) are not accurate either. In NCAA 27, the guard solo blocks the DT over him in a 4-3 defense. In the case of a 3-man defensive-front, the guard does not double-team the nose, but either fans out to the DT outside him (or goes for a linebacker). The bottom line is that the standard triple option reads the first defensive lineman OUTSIDE the playside guard, while double-teaming (or combo-blocking) any defensive lineman over the guard (or inside him).
So, in a nutshell, NCAA 27 forces the QB to read a solo-BLOCKED defender (sometimes TWO solo-BLOCKED defenders) in the A-gap when making the dive read. This is anti-thetical to philosophy of the play, because 1) you should only read an unblocked defender, and 2) the offense cannot reasonably guarantee that the defensive lineman inside of the read-key is neutralized via a double-team (combo) block. The QB is basically just guessing as to when he should hand off. as he cannot possibly read this mess with any consistency. In many cases the defensive lineman over the guard can simply blow up the mesh between the QB and fullback (effectively tackling both). In real life, this defensive lineman would be the target of a double-team (combo block), thus making it almost impossible for this to happen.
And don't even get me started on the pitch-key issues...