It does come down to circumstances really. If everyone in the house is paying equally for the internet access, then you should reasonably be expected to have an equal 'portion' of the bandwidth.
If the person in question is paying for the internet access himself, but is graciously letting everyone else use the internet for free, then its his to dish out as he sees fit. If he wants to hog the bandwidth and give everyone else nothing. Tough really, since you arent paying for it.
In the first case, though, Zebs suggestion of getting on sounds like a plan. Im sure the other housemates wont have an objection to you tuning the router to make it better for everyone, provided that you dont kill the router entirely.
On Zebs second suggestion, if you are all paying for the internet access equally, then you arent really 'hacking'. Its yours. you cant really hack whats yours. You are more... penetration testing the router. yes. that'll do!
