You're right that 90% of ico's are scam because I experienced it myself last time when I invested my money in some money grabber ico . I thought that it was legit because their preparations are good so I trusted it but after a week or so they just lost .
Trade wisely, but the day trading is a really hard game with seasoned experts, you are definitely going to get burned. Go with solid coins or tokens with great promise and teams.
The best altcoins to me will be ICOs that will emerge with tangible projects in 2018.
Now that the mostly weak hands have left or people are more cautious, the market will stabilise towards coins that have more promising techs and solid teams, like MeVu.