Now my first play through I set out to kill as many Thalmor as I could, and I'm a little sad your not allowed to go back in the embassy and clean house after the main and the civil war quests. Yet I can see why other players could either care less about the Thalmor or even agree with them or want them as a optional group to join.
However what this topics about is all the "Thalmor are unbeatable" talk I've read. I know it's not a huge chunk of the fanbase but there seems to be allot of talk of how theres no way the Empire or Skyrim could beat the Aldmeri Dominion. I've even read some people talking about how fitting some DLC would be where the Thalmor invade and slaughter everyone in Skyrim and the Dragonborn meets a bitter end.
While they're completely in their right to think what they want and desire any DLC they seem fit I just don't get all the Thalmor praise. The Thalmor are spoken as if they're invincible when theres plenty to contrast that in game lore. Imagine if people had that mindset in our world
"O that Hitler guys too tough lets give up",
"we're doomed Rome will never fall"
"theres no way we can stop that Atilla the Hun Western Europe, lets not all unit and finally push him back."
As for the game lore
2E
-Tiber Septim uses the Numidium to bring Valenwood into the Empire and the Thalmor fade out.
4E
-Battle of the Red Ring, the entire invading Aldmeri Army is destroyed in Cyrodill.
-The Aldmeri Dominion withdraws from Hammerfell entirely after Hammerfell fights them to a stalemate.
My long winded point here being that there is in game historical sites of the Thalmor losing or failing to achieve their goals. They're not some unstoppable force that cannot be beaten. lets just assume the Dominion decides to invade Skyrim, do you think the nords will go quite like? What of the Dunmer, yes Morrowind is not what it was but do you think the Dunmer would ever bow to the Altmer? Or the Argonians? Do you really think they'd let the Dominion come into Black marsh? The Orcs, Hammerfells and the Reguards the list goes on and on with plenty of reasons why the Thalmor aren't as big and bad as they might seem.