Only 3 bad signing so far
Rodrigo - £14.75m
Nem - £3.5m
And a Brazilian free agent. Forgotten his name, but I signed him for my Luton team in the first season, was my best paid player.... And turned out he couldn't play for a year "Due to personnel reasons". :/
Both Rodrigo and Nem never even remotely got going for me.
Nem was my first signing on my Arsenal save, he played about 8 matches in which he was average, then spent the rest of the time on loan. Ended up selling him for £13m so not bad a bad transfer overall, he just flopped in terms of how he played.
I bought Rodrigo in the 3rd season, as Falcao had been alright for me in the previous season, but not amazing, and Poldi was getting old. He ended up playing 16 games and scored 1 goal. Luckily, I got £16m for him when I sold him to Monaco the season after!