I get about 35% CTR on a video blog that i own and i think every CTR is ok as long as you comply with the TOS My 0.02$ will be to test different ad placements and colors tracked by channels (1 week for every placement) until you knoew what's the best for you
ah one week test is good. I used to only have one big square adsense block on each page and the ctr was much higher. well i just changed two days ago so I will wait and see. maybe my site looks to adsensed out now