Hardly! The point of the graph is to show at a glance who has the most market share. Neilsen's graph doesn't do that at all.
If the problem is not showing all the information, then find a totally different type of graph. Or put them into multiple graphs, one showing the 4 biggest players, then an "other" segment. Then show another graph of the "Other" segment and show the proportions in that graph.
Agreed. The "manufacturer" dimension given that 4 of the 7 OS's only have a single manufacture. Pull out the manufacturer data, size the blocks properly and you have a very informative chart.
If the problem is not showing all the information, then find a totally different type of graph. Or put them into multiple graphs, one showing the 4 biggest players, then an "other" segment. Then show another graph of the "Other" segment and show the proportions in that graph.