No one can con-firmly say that this coin will go up or down, everything depends on how much analyse you have done and how much risk you can take it. Some coins will give you profit but some will also give you loss. You have to decide how much profit you will book according to it you have to risk it.
If one can do his or her analysis very well I am sure the ratio of bad coin to good ones will be very low, especially now that we have IEO projects and I am sure that any portfolio built up by IEO projects will virtually be good and great gain in the future.
It is much quite risky now and waste of time to do much analysis on most ICO projects we see now as many of them do not have a sustainable product that will lead their project to a bright future although we still have few ICOs that are struggling to meet up to the standard. Analysis for me only works on existing project and not these new ones.