Ok, I'm confused (don't take a lot I know

)
A couple of months ago I took the Omega to WIM in Chesham for an alignment. They pointed out that my front wheels were pointing in "opposite directions" and as a consequence the inner edge of my front tyres were worn dangerously low - i.e. cords showing

. Ok from now on I'll be checking the whole width of the tyre - lesson learned.
I needed some new tyres there and then and asked what they had available in 225/55/16. They didn't have that big a choice - and suggested Falkens - which they assured me were good tyres - well out of the rubbish group and at the lower end of premium.
I'm now noticed that OOF generally dislikes these tyres.
So, can someone explain what's wrong with them please, and if they are as bad as I'm thinking you think they are, why do WIM suggest them? Seems that OOF rate WIM very highly but then get advised by them by buy a poorly rated product.
I have to say that they have done about 4k on the front and feel fine to me. I don't tend to chuck any car around in the wet anyway, and have had no probs at all with them so far.
My rears are Dunlop SP sports - (did have on all 4 prior to the WIM visit) which are now starting to get low @ about 4mm. With the onset of winter should I leave them where they are and replace the Dunlops when they need doing, or swap the fronts and backs over and wear the Falkens out.
Thanks guys ........