I played through the new X-Com once on Classic, have no real urge to play it again until they sort out the mod situation in a way beneficial to the end users/modders.
This game isn't bad, but the simplifications and outright removal of what I'd consider 'basic' X-Com features pissed me off. I do feel as though we could end up with a truly amazing game if they just opened it up to modders, to let them crank it more in the direction of the original X-Com.
1) Base Attacks
2) Far better inventory system
3) Better panic system for nations
4) Less of a "required build path" for the base
5) Bigger shuttle/More Marines and Robots on a mission
6) Less of the global upgrade of all enemy units, preventing you from responding to some requests from Nations for items/bodies from certain alien species
7) Ability to intercept terror/abduction attacks
Mods do some of the above, but you have to take steam offline, etc. It's a huge hassle to me, when there is so much else to play.