Rod Black is barely tolerable as a TV commentator. On the radio he is useless. If it were not for the TiCats TV feed I wouldn't have any idea as to what was happening on the plays.
I was able to watch Grey Cup sporadically via internet from Kinshasa, DRC. When the feed cut out due to poor internet quality, I was able to tune into TSN radio for the call by Rod Black. Aside from the occasional right to left or left to right, his descriptions were sub par.
A radio play by play person should be able to describe the time remaining, down-distance, scrimmage point and formation of the offense as well as any obvious pre-snap indications from the defense such as showing a blitz. When the play commences there should be details as to who has the ball, where the play is going geographically on the field (strong side, weak side, right, left, the flats, over the middle, deep, off-tackle) where the play ends and what not. We don't have TV to fill in these details. It might sound like a lot but with experience and practice it can be done. Rick Zamperin and others know what they're doing on the radio and can get all this info across.
A typical play with Rod Black sounded like this,
"First down Ti-Cats. Collaros looks downfield. He throws. Its caught! A little razzle dazzle and Banks is finally taken down."
If I'm just listening.. what just happened?
That said, the post game discussion was great including contributions from Rod Black but his play-by-play is awful for radio.