When evaluating new technology, framework or library; a lot of importance is given to the salient features. While it is very important to know the positives, the negatives usually tend to be glossed over. Being aware of the shortcomings of a framework gives one the ability to anticipate problems down the road.
For example, let us take NoSQL databases. A lot of time is spent on singing paeans to the scalability, malleability etc of NoSQL databases while hardly thinking about the negatives that come with it.
Two simple techniques which give a good visibility on anti-features:
1. The very obvious one, Google for the shortcomings. Someone would have written a blog post on the interwebs highlighting how a framework or technology let them down. For example, take this post by Uber on how Postgres did not work as expected for them.
2. Comb through Github and/or JIRA peeking at the bugs raised and enhancements requested.
Both of the above will provide a good picture of the shortcomings. If you are evaluating a closed source proprietary technology, the above may not make the cut.
Once a mental note is made of the negatives, ponder on the scenarios where this might affect your usage. It helps to spend quality time on this as this will save one from a lot of future trouble.
If you think about this, this might sound very obvious but tends to be highly neglected. We get so caught up in the positives of something that the negatives tend to be ignored and this usually comes biting us back later.