Another one in the minority who likes some homework. I see the difference it makes in DSs' work (they are yr 3 and 5) when they have been learning spellings and their tables. Practising these basic skills, and reading, every day will prepare them for life and should not be seen as a chore. You must see that they learn quicker than we do, so now is the perfect time to be encouraging knowledge into their sponge-like minds! Even if the school isn't setting homework, the OP's son should be reading daily, practising tables (if applicable), maybe having an informal spelling test at home every week (this can also help his vocabulary and literacy)
My yr5 get 3 pieces every fortnight in addition to spellings (he has moved beyond needing tables tests now). Each piece is reinforcing stuff they have done in class (eg long division), or is a preliminary fact-finding task before they start a new topic (eg find out what you can about Greek myths). Without these, I wouldn't really know for sure what they are doing at school and wouldn't know if he really did understand some new concept.
The great thing is that because we have always explained the point of this style of homework, the boys actually enjoy doing it and showing off how well they can work. And spellings/maths test results are something for them to be proud of.
We plan the homework to fit in round other activities and weekends away. They know when it's to be done and that afterwards they can do something of their own choice. We don't have Xbox/wii/Ps etc but they enjoy computer games (driving ones mostly, but also Lego.com and minecraft) and playing outside (footie, trampoline, swingball). Screen time is monitored (pc and tv) and they certainly watch more than I did as a kid! It's the healthy balance of activities that I think is important. My friends son does nothing but cricket and football (local teams), never does playdates etc. down time is spent on PS cos he's knackered. I wouldn't call that a healthy lifestyle for a 10yr old either.
OP WNBU to wish for more homework but WBU not to instigate some herself and perhaps look at how the child is spending his time and aim for a better balance. 