My latest campaign is producing a 5.8% CTR.

I am a Google Adwords newbie and have been trying different things with my advertising in my first couple of months. I started the new year with a campaign that implements everything I have learned in my first two months advertising on Adwords.

My preceding campaigns had between a 2-4% CTR. This may have been effected by me making a lot of changes and trying different things. My latest campaign is producing a 5.8% CTR.

I can imagine there must be a significant variation between industries/competition levels etc but broadly what do you consider to be a 'good' CTR? Obviously your ROI is your best indicator of any advertising campaign but I am interested to hear how high you have all got your CTRs as I understand CTR helps you big time with your Quality Score.