Here is an example:
And here is the legend made legible:
Too much art, not enough science. (See this post.)
I wish the designer lost some of the data. The graphic would stand a better chance of succeeding if the unimportant bits were not shown, or faded out. Giving every piece of information equal status, whether it's a shot on goal or a dribble, is another way to distort information. It downplays the important information while overstressing the filler materials.
Colors shouldn't be assigned at random. They should surface patterns. Make the Barca data visually distinct from Man U's data. Similarly, unify the numerous statistics on goal-keeping.
A more subtle misstep is mixing up whites and blanks. According to the legend, blank means ball out of play while white means offside (for either team) but readers can't tell these two apart. The whitespace looks like gaps.
For me, this is a lost opportunity. Visual exploration of data is a very powerful concept; it can guide further analysis and even guide the construction of mathematical models. But the visual has to help organize the information. Here it didn't.