I might be biased here, but I still think Martijn is one of the better casters out there. Leon was great as well for the Dreamhack casts.
I do have a suggestion though Martijn, if you're tweeting or otherwise busy during game, maybe put your cam on the co-caster's perspective while he's talking?
Otherwise mostly good on camera work though. Plenty of other casters where I just see the minimap going crazy with battles and said caster just concentrate on buildings or whatever.
Keep up the good work!