Spell Creation is gone. - I miss this, but it doesn't go with Skyrim's current spell system well.
Disposition with NPCs is gone. - You mean the stupid pie chart mini game from Oblivion? That's been replaced with more meaningful persuasion dialogue topics?
Having merchants re~charge enchanted weapons are gone. - I fail to see how that's a bad thing. Just makes soul gems more useufl.
Lock Picking spells are gone. - They're not gone. There's a standing stone that gives you that ability. The spells themselves were "removed" because they literally made the lockpicking skill, perk tree and advancement useless.
Athletics is gone. - You mean the skill you increased by...running. It was useless.
Attributes are gone. - And replaced with a new perk system, which IMO is better.
Several summon spells are gone. - And replaced with different ones.
Ability to kill anyone is gone. - Which wasn't in Oblivion anyway, only in Morrowind. And with dragon attacks and radiant AI you'd cry if a dragon killed a character from the main quest.
Being able to do Alchemy anywhere is gone. - And replaced with a different system to make it less overpowered.
Repairing gear is gone. - Reasons for this were explained. The focus is now on improving equipment as opposed to "making sure it's not worse".
The Arena is gone. - The arena that didn't exist in Morrowind either. It's not got a place in Skyrim.
Several types of weapons are gone. - No more than Oblivion, it's just been condensed into two skills as opposed to...well...two different skills.
Several types of spells are gone. - In order to make magic feel more...robust.
Spell Creation would have gone
great with the new magic system. I would have loved to have been able to make a much larger, and stronger, cone "flame thrower" Frost spell.
More meaningful persuasion options? What game are you playing? How many merchants can I persuade into giving me a discount? Can I, once an enemy yields, persuade them into giving me their gold and then telling them to run off?
Merchants re~charging enchanted items was useful. It was a way to give the player a two option system, now we have a one option system.
With said Stone, exactly how many times a day can I unlock a lock? The Lockpicking Skill tree and Perk system are useless even without the spells considering I can unlock a Master Lock at level 1 if I have enough Lockpicks and patience.
Athletics was useless? Evading damage was quite useful.
New Perk system has several useless and boring perks.
Yes... summons were
replaced. Keyword there. Not additional ones added, flat out replaced.
Um... I wouldn't cry if a dragon killed a quest giver, it would be a much more immersive game.
Alchemy is still overpowered.
Yes, now we can upgrade gear to godly levels via power leveling and bad balancing.
The Arena could have been sparring matches with the Companions. Or at the College.
Removing weapons just to remove them is not amazing.
Spell system is hardly "robust."