Separate the view from the action.
A bright landscape may invite you to explore, but the game inside it could ask for accurate jumps, quick reactions or a carefully reasoned solution. Screenshots show a moment. A description of the main activity tells you more about the experience between those moments.
Think about the effort you enjoy.
Some players like learning a movement through repetition. Others prefer a puzzle they can think about without a timer. Still others want to follow a story while occasionally solving a small problem. Those are different preferences, not different levels of enthusiasm.
Notice the consequence of a mistake.
When a game description explains checkpoints, retries or optional assistance, pay attention. A difficult action can feel quite different when trying again is quick. Do not assume every game offers the same kinds of help; check the version you plan to play.
Leave room for a change of mood.
The challenge that sounds interesting on one day might feel tiring on another. Keep more than one kind of game in mind. A shortlist built around different activities can be more useful than a list of games that all ask for the same effort.
Instead of “Is it easy?”, ask “What will it ask me to practise, notice or work out?”