Is WOTC still worth it with mods? And which mods are the best now? Any developments? Why are people going back to LW2?
Because it is overall a better game. WOTC has better engine, but that was evil from Firaxis to not implement engine improvements into base game.
EDIT: Or if I was to go into more details, LW2 still has better and more strategic geoscape where you don't get exactly 4-5 missions per month but much much more and failing them is not such a big penalty and you are not even expected to win or even try them all but pick and choose what you can and hope you did well enough (kind of like original UFO).
LW2 soldier bonding system is based around officer and units getting bonuses from being in same team with the officer longer. Officer gets bonuses like extra actions that he can give to other members of the squad within certain radius.
WotC bonding system is only between two units and it makes your troops too OP. Also the bonuses outside the extra action are often invisible and useless.
New classes and skill in LW2 are also very interesting but more balanced than what WoTC has. For example Reaper is a completely OP version of Shinobi. Shinobi also gives you a big scouting bonus and can do some missions alone but you need to play smarter with it. Fucking up with Reaper is only a matter of bad luck, not that much strategic placement (I had them lose concealment because aliens would get activated by Lost and then move to cover next to Reaper which was not that close to those aliens).
Different abilities and skills in LW2 are way better balanced than what WotC offers. Combat with 8 troops in mission one and being able to bring between 1 and 10 soldier to most missions (with its own cost or benefit) gives you way more freedom to play as you want. Not basing your whole tactic on blowing up enemy cover and then one shotting them changes how you play the game. More item slots from day 1 and temporary HP armors make it so you can bring more utility items into missions and regularly use flashbangs and smoke grenades during battles with them having a real effect on the battlefield.
Combat in LW2 is not based around waiting for enemy to walk into overwatch traps, you need to be prepared that enemy can hear sounds of battle, and come from a side and get to move and attack on their turn. No more putting everyone on roof and waiting until enemy comes and you get free overwatch on everyone. Yea you can do that but if one of enemies survives that guy now gets a shot at your guy that is outside of cover.
You will lose people no matter how well you play but since you can field bigger troop numbers per mission your missions don't end when you do (especially if you use lower ranked troops to be those guys in risky positions). This part feels more like original UFO than nuXcom.
Timers on missions are balanced better now, they invite stronger and stronger reinforcements and don't instantly end missions (WotC did fix some timers but also left a bunch of them intact). In a bunch of missions you get your resistance soldiers to fight alongside you and they are not OP like what WotC tried to implement.
WotC didn't fix anything about early and end game balance. Start of Xcom 2 is still hard and end is even easier.
LW2 makes start easier but mid game and late game harder.
LW2 has no Chosen or Lost. Both were not a good addition to Xcom2. We don't need superhero units like Chosen in Xcom like games and Lost are irritating after two missions. Also once you learn how to play those missions, getting a Lost only missions is autowin.
Overall still a superior product.