Is is still worth enough to invest in these three categories when there are hundreds of them in the market with similar features?
Exactly,
there are hundreds of them in the market with similar features. This fact makes the process of choosing the right coin so hard. Well, we can't do anything about it; only we can do is to be as smart as possible when choosing. So remember, always read the whitepaper whether it has a bright vision or not, get familiar with the developers and double check their reputation, and lastly, be updated on the news around you because this is an important factor which affects the ICO's future.
But, if you are still feeling hesitated when investing with new ICOs then don't push. Practice first on the old stable alts you knew.