It isn't necessarily way too little. It depends what it is, and how he is doing it.
My feeling is that my children get way too much - that they are given it because the teachers feel that they must. It certainly isn't all valuable - lots of it is long drawn out projects, although this is getting less as they get older.
The level of homework has contributed hugely to family fights, and has made it difficult to pursue other activities - cultural and sporting.
Ordinary things which could and should be being done outside school hours, like for instance reading, have completely gone out of the window : whereas in earlier years they would have curled up with a good book, now the whole evening is filled with homework, nothing ever gets read.
It also makes it hard to impose things like music practice, or even just playing music for fun.
The children are at school from 8:30-4, get home at about 5 if there is no after school thing, later if there is, cram in food, and then do homework. When the homework is difficult or project based, it can take the whole evening, and then they go to bed.
It can make any pleasure you might take in your academic subjects feel instead very arduous. It also totally prevents anything useful like reading around a subject you love.
However, this is a luxury perspective from someone who is pretty sure that, because of the high homework demands, most academic bases are being just about covered. It somehow doesn't feel like much fun, and I am not convinced it is all necessary.
From a mother's point of view, it feels like a bit of a grind, and it is getting hard to get those things we talk about like "a love of learning".