We never normally make great games for jams.
But they do give us the opportunity to test ideas, practice our skills and experiment.
Just making and submitting a game for a jam is a challenge in itself, and when you've never done it before I find you end up thinking "will it be enough?" Or "what if no one plays or likes it?"
In the jams I've been in, I've always found the community welcoming and understanding, we all put the effort in and want to improve, and it's all part of the fun.