Not always, if the project have not a good potential for (my opinion). I wount invest there.
of course we should only invest in the project we believe however reading whitepaper is very important, every ICO must have a whitepaper, it may be just reference informations and should not be trusted 100%, informations can easily be faked by scammers and of course, we should never trust them all but always becareful when choosing to invest ICOs.