1.Honestly Zidane on a club level.
Zizou could have won so much more with us. With Real he won 1 CL and 1 Primera for 5 seasons. This is so underwhelming for a guy with his abilities.
2. Ronaldo (R9) on a club level.
3. Inter's failed talents - Recoba, Adriano, Vieri.
4. Players with high expectations but little end product - Saviola, Robinho, Van der Vaart, Diego, Cassano etc.