did u activate 2 torrent at once ?

then u may not get a fair judgement , IMO thunder did not seed , but it is using all the upload speed to get more ip address hence ur modem or router may be clogged by xunlei (it really know how to "monopolize" the bandwidth) before utorrent get a chance to erm , utilize the upload bandwidth , and if not mistaken u are using 1Mbps line rite?

there are others factor of coz , the location of peer, the number of seed , etc .... so i can't say ur judgement is really fair

i just download a 4gb file in about 1.5 day using uTorrent 1.9 alpha

PS: u can kinda monitor ur network using some program , may b that is more fair , in my case i used cfosspeed