I would say that it is quite slow. I am using 512 ADSL with BT Broadband.
Try the speed test at ADSL Guide which can be found
here
I have just tried it and got the following results which may be useful for you to compare against.
Downstream 458 Kbps (57.3 KB/sec) 494 Kbps (inc. overheads)
Upstream 244 Kbps (30.5 KB/sec) 263 Kbps (inc. overheads