They're also exceptionally low, currently. There are no rates above 35%, whereas they used to be above 70% back in the Eisenhower/Kennedy/Johnson/Ford/Carter/early-Reagan days. But I suppose which rates and which kinds of incentives count as too high / too low is always relative and subjective...
Actually, under Eisenhower and Kennedy the top marginal rate was always between 91% and 95%. Then it was 70% until the early 1980s when it went down to 50%.
That's just federal, not including state and city income taxes.