I'm not very technical when it comes to routers and ADSL but here are my thoughts.
Your landlord has gone to the trouble of providing you with wired connections rather than leaving you to struggle with wireless, so he may be sympathetic to your problems and help you as much as he can.
You need to see if the problem is with the ADSL connection so you need the router stats. You will need the router login and password to get these. If your landlord doesn't know, they may have been left at the factory defaults.
If you have a good connection, it is possible that you have maxed-out the capacity of the line. If your house-mates won't agree to be responsible with their usage, you might explore whether the router supports bandwidth limiting or QoS profiling. However, sharing available bandwidth by enabling such features is likely to please nobody, yourself included.
Finally, since you're a student, if the poor connection will affect your ability to study, your should definitely complain to your landlord, especially if he specialises in letting to students. Otherwise, you could forget about gaming for the time being and concentrate on your studies. There are plenty of other amusements available to you when you are young.
Edit: It is also possible that you have maxed-out the capacity of the router, especially if it is a cheap one. I will leave others to comment on this.
Sweet Thames, run softly till I end my song,
Sweet Thames, run softly, for I speak not loud or long.
Edited by micksharpe (Sun 05-Oct-14 14:59:09)