CJ, you are right. We do have to give a certain amount of leeway to film makers when judging their translation of the written word to screen. Things do get swapped around, changed, and bits get cut. This is a fair expectation.
There is one point I would disagree with on. I can't by any stretch see the changes made as being minor. (What follows are general comments for all - and certainly not an attack on your opinion).
Couple of points, by no means everything.
Reacher Gilt. Gilt is charismatic, he throws lavish parties, he is the man to be seen with. He is 10 times the con man that Moist could ever be, (by Moists own admission). Everybody sees him as lovable rogue. They laugh at his jokes about robbing them blind. He is such an artist of the long con, that he tells people not to trust him and they laugh at his waggishness. He is the master of all con men. Loved by many, respected by all, and feared by some.
Sky's production reduced him to nothing more than a cheap two dimensional cartoon villain. I was expecting him to say at the end, "I would have gotten away with it if it wasn't for the meddling kids", as he was exactly like a Scooby Doo Villain.
In my mind, most of the other characters under Sky's eye didn't fare any better. Adora-Belle's transformation into gymkhana girl being a case in point. Totally unnecessary, seemingly put in to provide a little bit of sexual undertone. Or as Peter Kay might put it: "A bit of blue fer Dads". Simply no need for her to jump on the back of Boris and ride with Moist. The narrative delivered at the abandoned clacks tower could have fitted pretty much anywhere.
EDIT: Oh yes. The wizards! Mustrum Ridcully dropping his gaze? Cowed by Ventinari and
Reacher Gilt? Bumbling, yes. octrane addled buffoons, definitely, (not counting the Librarian of course). But subservient to...well anyone? Not a chance. They be singing Paul McCarneys Frog song before they knew it.
One of the pivotal moments in the story, was when Moist was presented with Boris. It was the scene when his, shall we say "friendly con" of his colleagues, customers, press, and of course Adora, came to fruition. This was reduced to a something meaningless.
I think I'll stop now. Of course this is my opinion and nothing more. If people liked it. Good for them!
In the spirt of things I will sign off thus:
Disgusted of Anhk Morpork.
It seems that beggars can actually be choosers.