In a large bowl, combine garlic, wine, Worcestershire, parsley, 1/4 tsp. salt, and 1/8 tsp. pepper. Add meat; mix well. Gently stir in crumbled blue cheese until just combined. Form meat into 12 meatballs. Cover and chill at least 1 hour.
On four 12-inch presoaked skewers, thread meatballs, red onion and mushrooms, leaving a quarter inch between pieces. Brush onion and mushrooms lightly with olive oil and sprinkle lightly with salt and pepper.
For charcoal grill, place kabobs on a greased grill rack directly over medium coals. Grill 14 to 16 minutes or until meat is no longer pink (160 degrees F), carefully turning once halfway through grilling. Add hamburger buns and grill the last 1 to 2 minutes until toasted. (For a gas grill, preheat grill; reduce heat to medium. Cover and grill as above).
Serve kabobs with buns, arugula, and blue cheese wedges. Makes 4 servings.