So, I've finished my 2.5 campaign on standard, and there are issues that need feedback.
The stat progression is now fast, but quite uneven. In the campaign, I had some ~60 missions, all done by one team, the second one was just getting ready when I hit the endgame tech. The assault skill is definitely fastest progressing, and I hit a few superhuman level assault troops, mostly thanks to machinegun. Strength was, on the other hand, biggest blunder, both as starting stat and in progression. On the beginning, only few soldiers are able to utilize combat armor without going over 50% weight, if I want to keep my options open by giving them at least medikit, few grenades and one reload (that's pretty much what I consider bare minimum once you get few months within game). Those few early recruits can get decent strength before armor, decent complement of grenades and medikits become necessity, but integrating new troops into team becomes horribly frustrating. Basically you end up with few supersoldiers that make up a core of unit, and high turnover fodder. And my attempts to give the soldiers "realistic" loadouts with sidearm, knife and spare reload for both needed exceptional and experienced soldiers.
Weapons and weapon stats. Well...assault skill seems to be the most important one. It's good to have a sniper or two around, but I found these to be mostly pulled into "throughwall" niche by late game. A big one, mind you, I was clearing corrupters by pinning down enterance with long range RF, and used snipers+IR spotters to shoot out aliens through the floor. Close skill is next to useless. Few weapons use it, and with exception of sidearms (that I almost never pulled out) they are quickly replaced around midgame at latest. Explosive skill is another niche, although a good rocketeer is useful from time to time. Grenade launcher is, with the omission of burst fire, useless as in most cases old good frag grenades or standard firearm do the job as well. This skill is mostly about grenades.
There is a lot of useless weapons. From starting human tech, I found little use for shotgun, GL, flamer and micro shotgun. Sidearms generally were pulled out only couple of times. As the game progressed....I tried to use plasma blaster, but its niche-8 TU ball shot-is simply too small to justify using it. Heavy laser was also of little use. By the time the extra punch per shot gets more useful than better TU/damage, clip size and versatility of laser rifle, I had better weapons already and soldiers that could effectively use them and didn't need laser's precision. Needlers are downright useless against anything with armor, and that is everything by the time they get deployed. PB are rare, powerful but they're, IMO, overshadowed by EP guns.
In the end, the weapon balance seems off toward humans. Early on, you are facing just sidearms, so your tech is better. Briefly, aliens have superior firepower with plasma rifle, but soon after that humans get the lasers, and balance is shifted toward them again. Then, as aliens get needlers, humans can effectively deploy EP weapons. Then, at endgame, it becomes a matter of who hits first. A full auto from EP AR kills any alien just as well as burst from PB rifle or cannon tears up a human. Frankly, it feels like aliens are trying to catch up with humans all the time, instead of the other way around. Like I said, only in one, quite brief, period I felt outgunned on the ground, and managed to quickly turn that around. Aliens beat humans on the armor though. But still...in the endgame, armor stops only glancing shots. When someone, alien or human, takes it fully, it's adios.
Campaign pacing. Campaign is divided into few discreet epochs. I felt there's too few of them, and not well spaced out. The campaign went in a rush toward harvesters-both scout and fighter phases were too quick. Then, the game stopped for a few months. I was fighting the same battles, had time to research everything and upgun. After that, a brief phase with supply ships ensued, and next month I had a face full of corrupters. Before I had time to research most of the tech, I had a visit from bomber. Endgame. I didn't even get to deploy power armors and face gunships, the first UFO from this wave was a bomber right away. I know that alien progression speed is inversely proportional to your performance, the more you let them complete their objectives the faster they progress. I didn't miss much I think, because after first month my relations went just up, and I didn't lose any ground mission. Something probably slipped through my lacking radar coverage, but that was inevitable. By the time of endgame, I had only most of Americas, Europe, Africa, and bits of Asia covered, and was building another base that was to cover most of the rest of Asia and Australia.
So...I think this is needed at least: Aliens should get a new weapon-light plasma rifle-right away It should be more powerful, slower and longer ranged than pistol, while being weaker but more accurate than normal rifle, acting as light sniper support. Needlers should lead not to coilgun-leave that to heavy needler-but to advanced combat armor, something lighter and stronger than normal combat armor, but not as protective as nanocomposite armor, to help fielding new recruits. EP ammo should also wait until heavy needler or perhaps even medium alien armor.
For the alien waves. I think the early skirmishes should last a bit longer. Needlers should come a bit sooner, perhaps before supply ships. A bit longer time between supply ships and corrupters, and separate heavy needlers+medium armor+gunships to come before, not with, bombers and PB weapons.
Well, that's all for now, might have more to add later.