So I kinda hijacked this question from here because the thread itself got pretty weird and I am not sure if the casters were even reading it anymore after they asked for opinions/suggestions for improvement.
First off, I and many others really appreciate the time and effort you all put into casting matches. Thank you.
1-- I notice that quite often the caster will be doing play-by-play but the camera-man is not watching the same player so the information and action being casted is a little unorganized because it is not on the screen. I am sure it is a major challenge to get coordination down between camera and caster but it would likely improve the overall experience, especailly when critical things happen.
2-- When a player off-classes to Spy or Sniper, it has become commonplace to focus the camera and casting on that player because some "big play" could happen. I don't disagree with that style but until the Spy/Sniper are in position to actually make a play, we should not be watching a spy run around to get into position. The 2nd caster should be shadowing the spy/sniper and let the main caster continue to talk about the action until the the time is right to switch the focus.
Again this requires good communication between casters and camerman so I understand it is a lot easier said than done. This exact thing happened during some of the i-series casting with Lange and Admirable and again at i55. It was pretty awesome awesome the way they switched on the fly.
3-- TF2 casts have historically missed a lot of important action on the flanks, especially back-caps that end rounds abruptly. Most times, those plays are talked about in the past tense and have already happened off-camera. Obviously the main attention is on the combo the majority of the time and that is just fine. However, I believe it would help the cast if the "main caster" focuses strictly on the action at hand and UBER. The "support caster" can then concentrate on any wild cards like off-classes and view the larger picture with free float camera. Then he can interrupt the main caster and cameraman when a major play could possibly happen away from the combo on the flank.
Several times during the i52 and i55 casts there were back-caps on process, badlands and gullywash that were completely and utterly missed until it was too late. One time in particular was when EPSI scout Kiler4fun was literally hiding behind the last cap point on Process against FROYO during Grand Finals. He was there for like 2 full minutes and the casters did not see him at all and never even knew he capped the final point until it was over. The cameraman spotted him but the casters were oblivious.
Hope some of that helped bring out ideas and such, you all do a fantastic job.