Same issue here with a Thinkpad X200s and built in Intel 5300 agn on 11.10 with 
3.0.0.12-generic kernel.
After disabling n-draft, networkbitrate in iwconfig changed to 54mbit (802.11g) 
but it is still very slow (Internet, browsing smb)
The same under normal n-draft conditions. 
Sometimes if i boot up nearby the router i get speeds of 3-4mb/s, under 10.04 i 
had 5-7mb/s (like in other OS). While writing speed is 270kb/s.
Nevertheless the responsetime of networkactivity is very slow all the time.

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https://bugs.launchpad.net/bugs/836250

Title:
  [Oneiric] Intel Corporation Centrino Ultimate-N 6300 poor networking,
  packet loss and very slow Lenovo X201 and T500 laptops

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