It's kind of hard to say this without sounding like a a schmuck or scaring you, but...
Take into consideration that no instructor will EVER sign you off until you're 110% ready to solo that airplane. To be frank, soloing an airplane has NOTHING on the adrenaline rush you get the first time you solo a student, or at least the was the case with me! Heck, I think with the first student I soloed they had to do a go around on their first landing attempt. I mean you can't imagine the kind of terror I was experiencing while I watched my student line up high and to the right of the centerline, nor how happy and proud I was that the next thing he did was put in the power and go around.
With that, I wouldn't have ever put him in that situation until I was 110% sure that he was going to make the right decisions when he got into the airplane by himself. He wasn't the perfect pilot, but he had great decision making skills and understood when he was in over his head and needed extract himself from a bad situation pronto. In my mind, that's what I was looking for more than anything else. Botched approaches happen to everybody, myself included, and knowing when to throw in the towel means a lot more than greasing on every single one of your landings.
So go enjoy it when you solo, and take some confidence from the fact that your instructor knows you're ready to fly that airplane safely by yourself! I soloed 10 years ago this last summer and I can remember like it was yesterday