Splaat

As OP mentioned, the fight against Alduin was my biggest letdown. It was faaar too easy for a boss to be. Even Tsun, that you have to fight before entering the Hall of Valor, gave me greater challenge than Alduin did. 

I definitely agree. Alduin was waaaaayyyyy too easy; on Master difficulty, it was like fighting a Blood Dragon on Apprentice (I don't play Legendary so I have no idea what it is like to fight Alduin). Bethseda really should have worked on Alduin as a really hard boss. Instead it ended up being your average dragon fight. With a meteor storm.

                                                             Ø¨_ب

Level 76- master difficulty. Three strikes of soul tear

Mine was when Paarthunax didn't talk to me much after finishing the Dragonborn Quest. I loved talking to him!

Kahdremonik

It's with Solstheim in the Dragonborn DLC. Some guy, can't remember his name, said that he brought Silt-Striders to the island quite a while back. Well, lemme just say that I didn't find one. They were the main reason I was pumped for that DLC, despite all the shiny new objects that came with it. for me, it wasw a trip down memory lane, let me tell ya.

I feel you, man. Morrowind all the way.

My biggest letdown for me was when I broke 30 lockpicks on a master chest and only got 15 gold. :(

Paarthunax. There should be an option to NOT kill him and still stay with the Blades. I liked him a lot... RIP Paarthunax. You were a good Yoda-Dragon

Oh, as High King I condemned Esbern and Delphine to work in my mines for all of eternity. 

Mods are the solution to EVERY Bethesda game.

Assassinating the emperor. It was way too easy to get on the boat and kill him and his guards.

You find a heavily guarded cave with around 20 bandits. You kill all of them, go to the epic chest in the middle where most of the guards were. You open it... 50 gold... gg

And even better: First you see: Alduin destroying a f***ing fortress! 20 guards can´t even harm him. When you return to Helgen later everywhere are burnt corpses and buildings. Then he revives other dragons. You still can´t harm him. You have to find that damn kel just to have a chance to fight with him! Then you need another dragons help to reach the portal that leads to Sovngarde! And then you just kill him like every normal dragon knowing that even killing an icetroll is harder...

Ice trolls... I hate ice trolls...

Trollolololol! :D Me too... It feels like Bethesda wants to troll us! That shouldn´t just be a bad joke now...

Bad joke is bad :P