I don't think the reproduction is quite as bad as people make out.
Unlike some others here I haven't seen any other TF collections so its hard to say whether you should buy this or not.
I think that's the key thing here. If you don't care much about repro and/or don't have other collections, the early stuff in this set might not bother you. But I have the Titan runs of the UK and US material, along with the IDW UK reprints. The Hachette book is worse than all of them.
In terms of the US reprints these are from a period when Marvel were printing their comics on very poor quality paper. I think Marc Silvestri's run on Uncanny X-Men was from around the same time and I remember his art in particular looked as if he hadn't finished drawing each page (or else the inker had only inked three quarters of it). An awful lot of fine lines just wouldn't see the printed page. The colouring wasn't good on those original issues either so IDW may have had no option but to recolour. From that point of view the reprint is quite faithful.
The original Titan books were straight reprints. Those were faithful. These saw IDW outsource scanning/recolouring to a studio in India that apparently didn't care much about the end result. That means when you originally had rubbish 1980s US colouring with dots aplenty, you now have rubbish US colouring transformed into eye-searing solids, and a lot of the fine details have just vanished. On the assumption this is the same content as in the IDW US Classics line, this isn't the worst of it either – some of the recolouring work is really
On the notion that there may have been no other option, that's perhaps true – at least from Hachette's standpoint. But it's interesting to compare this approach with, say, Rebellion's. With 2000 AD collections, I sometimes have the odd gripe, but broadly speaking the scanning and retouching work has been very good.