In Germany? yes, he did good for two seasons with Werder, which had builded their whole team around him. After Diego left and Ozil came in his place and Werder were better, also ended up higher on the table (3rd, where with Diego they finished ~10th)
Dont know if you watch Wolfsburg, but if you do you'll start saying the same as me that the money gained from Diego's sale was excellent business. He's rubbish nowadays.