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Most people that monitize website traffic via adsense and get traffic to their site via adwords know that having a CTR of at least 30% is imperitive to being profitable.
There is nothing wrong with 35% unless you have very little content on your page with no other way for a visitor to leave than by clicking an adsense link.
I had Google call me last month looking for my opinions on what I thought of the AdSense program. Since I was only new (3 motnhs in) to the program I couldn't give a whole lot of input. But htey were curious to know my thoughts on content relevence, competitor links appearing in the boxes (filtering), CTR of AdSense compared to my other affilate programs. They said they'd call again next summer. I won't hold my breathe. :-)