You are the biggest fangirl and do not understand constructive criticism. And technically it is..
What constructive criticism? That it doesn't look good enough?
Is there any gameplay element to comment on? Well the shooting got better. We have a jet pack, adding new elements to combat. The game seems to only have improved graphically and mechanically.
Instead of comparing the obviously superior games from Bethesda to it's competitors, I'll talk about the changes that can happen.
1. Characters could have a bit more depth. In Skyrim everyone felt one dimensional. Oblivion did a MUCH better job making interesting characters. Everyone felt like they were hiding something. They were devious, even when being nice. Skyrim took a huge step back. Everyone acted like Skyrim was on their mind. It's cold, I'm for the stormcloaks, I'm against, Ulfrich, it's all everyone talked about. Talk about your neighbor spending to much time in their basement or something. Oblivion dialogue made you feel like it was a real world with it's own culture. I hope in Fallout we see this improvement. I doubt we will.
2. More options to physically alter the world. Not in a way like, I chose this option so x happened. I want to be able to burn cities down. Burn a house down. Use a bomb next to a wooden shack, it should blow a hole in the wall or destroy the shack. The more options I have that are like real life, the more I can role play. Of course other games don't have this. It's all scripted. But it would be nice to see. Battlefront has this a little bit, I'd like to see more.
3. More unique fun items. Especially in Elder Scrolls games. They do a a pretty great job making exploring fun, they've improved a lot game to game. But not because of items you find. Fallout adds fun guns, but more fun items can always be added. The Elder Scrolls lacks in variety. Morrowind allowed you too jump super high, across areas, bring that kind of thing back. More fun physics, more absurd shit. They should spend a lot of time thinking of fun items to add. The broken paint brushes in Oblvion actually added to the game. Even if it didn't make sense. It was fun to build a staircase and climb over walls or whatever.
4. More unique bosses. This is one thing I like about the Witcher actually. The enemies should be more legendary once in awhile. Build more backstories. Keep the battle fair, but once in awhile add a fun boss. The world of the elder scrolls has a lot of options for more fun boss fights. You don't even need that many. 3 or 4. Diablo was the best at this. You felt like shit was going down when diablo said "Not even death can save you from me." Every game should attempt to give this feeling to the player at some point.
The main story lines could use a little work. I don't need an epic quest, but Skyrims really fell flat. It was the worst of the major quest lines. Two blades members? It started off interesting, but was pretty lame. This is probably my weakest recommendation, it's basically just saying write better. An Epic story isn't needed. But it'd be nice to have a bit better of a plot. The thieves guild easily out shined the main story.