Re: How do you determine if an altcoin is worth investing in?
The coin is as strong as its community. Check all social media accounts they have and try to recognize if the community is the only group of speculators or active users. The speculators will leave the project as soon as the price starts falling down, while the active community doesn´t care much about the price. 
What if the speculators are paid to remain loyal to the project such that despite the falling they remain optimistic. I think this could mislead investors to invest with a vain hope.
many things are happening in this space.