mustardoverlordit's pretty funny that we've entered into a conversation about such banal things like how a play-by-play caster phrases things, when tf2 play-by-play casters, almost to a man, have 2 much bigger problems
1. missing important parts of the action (even though color commentators never seem to)
2. trying to cross over and actually give analysis, even when they're with a color commentator, and failing miserably at it
those are much more widespread and annoying issues to me
1. You're never going to see every important thing that happens in a match as play by play. When the action happens, it happens quickly, and fights are hectic. It's just the nature of casting this game; you're going to miss stuff sometimes. You should be able to catch most of the important things, but it's pretty damn hard catch everything.
2. I think taking the sports broadcasting approach is best here. That is, only doing play by play, and any sort of analysis is short and concise (a general point or underlying theme of the game, something to fill a small amount of time etc.), often used to lead your color guy into a topic of discussion, and have him expand on that point further.
Edit: To further expand on point 1: I think one of the main reasons PxP guys will miss things too is because if they are calling the action in a particular area, that's what they are focused on at that moment. If you are calling a team fight out on 2nd, it can be pretty tough to spot a scout that slipped away and is heading for a back cap, what have you.
Since I've only played at a high open/low IM level, I think that could also be attributed to missing certain plays, but not the reason for every missed play.