There's a meme that Diet Coke "tastes like robot sweat". (I don't know the source, but the earliest online reference I found was an anime forum from 2003.) btw, I prefer Diet Coke, too. :)
Same here. Regular coke feels a bit too sweet for my taste.
Most diet beverages I've tried I hated, but ended up acquiring a taste for once I pretty much had to go diet (diabetes)