My son has the same problem, and I like WW for the same reason! He also struggles with expressing his thoughts in words, so the passage and questions at the end of each unit are excellent practice for him. He likes exercises A-D well enough, but hates this part! We use WW 3000 2nd edition. I just noticed the website has games for students--took me long enough. We've been using it for 2 1/2 years! http://wordlywise3000.com
Amy