It can be predictable but not always but only if you found great project coin which is like example here in signature campaign then it would be great project,if coin owner advertise hard that coin,also buying top trending coins and sell later is really great strategy and really predictable.
but it is not a prediction. if you are talking about new ICOs, I don't think people can preject if a project is good or not. I can give you example of Pascal coin. few month ago when they started, they looked just like a random coin. so I ignored them and didn't follow them but just 3 days ago I saw they've listed in Poloniex and the number 1# coin in the Polo exchange.
and lots of successful ICOs still surviving in small exchanges but don't get place in Polo,