IMO I prefer the one we have in the UK (3+, 7+, 12+, 16+ and 18+), if only because it actually gives ages clearly. Though that one you made is better than the current ESRB ratings - games that are OK for under 11s are usually fine for people right down to childhood, so the way the ESRB split that zone up into 3 (EC, E, E10+) is a little stupid. Yours is better.

__________________