Gilles' tracks are hit and miss, mostly miss...
But I kept more than a few, mostly because
@slider666 has put a lot of work in it.
Thanks for this list - I'd been pondering buying a couple more of Gilles tracks, and this helped me choose which 10. I know his stuff gets a lot of stick either for its quality, or his methods, but some of these are the only versions of these tracks I've found, so here's my thoughts as well.
I like (and kept):
Chimay - Solid track and lots of kerb-hopping fun. Final corner is pretty randomly jagged at the apex though.
Mettet - Alright
Gedinne - Seemed ok, not really learned it in any detail
Autodromo Peñuelas - Lot of fun. Love this one
Meadowdale 1968 - Good fun, and cool layout with heavily banked corners. Has a gigantic jump on the first straight that makes even GT3 cars do a big wheelie. Not sure if thats accurate
Pudong - Big wide open street track, decent enough
Haute-Saintonge - Short with several tight corners, but interesting little club circuit
Maison Blanche - Fun little club circuit based on part of le mans. Doesn't look amazing, but the layout is great
Autódromo Internacional Miguel E. Abed - One of those south american oval road courses. A good one though and nice layout
Fundidora Park Raceway - Alright
Not so good (and binned):
Lydden Hill - Layout is ok and it looks okish, but lydden hill has loads of gradient and this is utterly flat
Toronto - Indycar layout and very angular road and walls, so far too bumpy even in something like a touring car, which is a real shame as this track is one of the best Indycar tracks. The part after where Jeff Krosnoff died is ridiculous. Undriveable in Indycars
Edmonton - Huge car park layout. Really dull and not a good mod either
Calgary - Track itself is ok but it looks just a bit too retro
Gnoo Blas - It would be tolerable if it didn't have one edge that went down this narrow and low-res bumpy as hell single track lane. If it was smoothed a bit it'd be ok. GPL era looks, bit like Boavista/Halle Salle
Kazincbarcika - Nasty little street track. Lots of graphics glitches, and generally poor
Autodromo de Rivera - Alrightish. Bit like an inferior looking Taruma style track. Has nasty (smoothed but) angular unnecessarily multi-apex corners
All of them look like rips of older games, so some are a lot better than others. Very few are the standard of some of the track updates done by the people in this thread. Its a shame he sells them as some of them would be so much better if handed over to you guys for an update. Bear in mind that my interest is more about the layout and driving experience, than every little graphical detail being 'just-so' - if a track looks pants I usually just switch sol to an hour before sunset (5pm ish), and it makes everything look a lot better.