This is a lot true, but it will show tendencies within games that we can evaluate. Which is the major reason I want it done.
For sure, you can get tendencies, but its going be have to be a really large table of data in order for you to draw any sort of conclusion.
I'm thinking that for every combination of team vs every combination of team on every map would need its own stat tracking, since the data isnt going to cross over terribly well, and once you've diluted the pool that much (That's a shitload of combinations) you are going to need to collect data for a long time before you have enough info to detect trends.
Theres also still things like the ability bug, minion exploit etc. You effectively need to reset your stats each time you make a major bugfix, or at least keep them separate.
Once the bugs are ironed out this stuff would make a nice addition. Are you thinking of what Valve did with TF2, with the "heat map" style death graphs overlaid on levels? That sort of info would definately be interesting for a game like DG (Which characters tend to die where, and after how many minutes of play) but I'm not sure it would help balance the game much. Food for thought nevertheless.