I just went through the Thieves Guild quest line and it was a decent line, however the characters became so static after the quest line... Saying the same things over and over, no change in dialogue after achieving Guild Master title, and no random discussion of the next planned heist or stories of their last act of thievery. Also, it was possible to not do any side missions before gaining the trust of Mercer, which makes no sense because DB was just thrown into the guild and had the trust of everyone despite not making a name of him/herself, which is even more depressing due to the fact that even Oblivion had you doing petty thievery before you were able to meet the leader. Also, no amazing piece of Thieves Guild artifacts? That's pretty saddening, especially because receiving the mask from Oblivion into this game would have been such an incredible nostalgic moment for I think most of us (honestly, I haven't taken the time to understand the lore of TES, so feel free to educate me

I would really like to see an expansion of this idea in the next TES, or possibly even part of a DLC/Patch.