I haven't read the review yet.
But as said it is a budget mobile and for the orange customers who can get it for cheaper, it is great wee device.
Your getting a great 4.3" screen, with a pretty decent CPU/GPU, camera, sound etc. that is perfectly fine for normal use.
Obviously a £130-160 pound mobile is going to be absolute crap compared to the GS 2, which costs about £400 brand new.
Also most people obviously aren't going to get it on contract as that is a rip off and you can get much better mobiles on contract for same or a slightly bit more.
It is a great option just to buy out right or people still on contract that can't upgrade for another good few months (like me).
Also who has said that the SF it is as good as a desire? lol.
EDIT:
What they mean is probably what the mobile is like for overall speed/smoothness (obviously once rooted and custom ROM on and all), what it is capable of doing that they need.
E.g. for my samsung spica:
http://forum.samdroid.net/f21/testing-new-htc-incredible-s-device-4630/
Even though the screen and everything else about the incredible S is much better than the spica, but when it comes to actual usability/speed/smoothness etc. they are both just as good as each other, obviously the more demanding stuff like games will be much better on the incredible S etc.