I see investment as a stable low risk term. I love block chain technology and think that if implimented properly could produce a great efficiency gains and cost reduction. Even with my bias to the technology and my liking of private transactions, all altcoins are illiquid and unstable. They would be better speculation tools, but their lack of liquidity means that when the bubble bursts you could be very rich or very poor.
I like to think that investment as separate from speculation so no I don't currently see any altcoin as an investment opportunity.
I do see altcoin as an investment opportunity but not for the new projects because we have yet to see if the team would be able to carry out what they have promise in their whitepapers while I may be willing to invest in the coins that have been existing for years because we can already see their developments and their project may already be complete and we can see the demand then if the people would use it for its actual use case or just for speculation purposes.
However, there are still new projects that are worth looking at and you will be lucky if you would be able to purchase it during ICO when the price is still cheap. Of course, you still have the option to purchase it when it is already listed in exchanges.