The developers past history also bring a lot to mind because nowadays there are projects whose developers remained in businesses or in projects which got success in the past and they satisfied their users. If someone do not know much better about the future of a project then they need to follow the project which is started by a successful business or project.
Having experienced developers is a plus to know that the project have a future and that it is capable of handling the issues and activities of the project. It is needed to have a experience to determine how they can probably work on the project. Though when it comes in new projects that is not backed by know companies or personalities I prefer to buy them once they already have new development, been done with ICO projects before that just disappear after buying. Good thing now we can buy in a much secure trading sites than before.
I will also add one more thing. As we invest in the project so that in the future the price increase and we get the profit so we have to ensure that the developers give a solid promise or proof that after the ICO they will list on a good exchange. Because in the past I participated in some project which were started by good running companies but after the ICO they still not listed on exchanges. I have the coins of some of these type of exchanges but they are worthless in my wallet.