Short answer: Yes โ Slither.io is absolutely worth playing. Here's the full breakdown.
Slither.io is best suited for players who enjoy io games and can invest 2-3 sessions to get past the initial learning curve. Players who only try one session before judging miss what makes Slither.io compelling.
If you strongly dislike io mechanics, Slither.io won't convert you โ the core experience is io through and through. Players who prefer story-driven or offline experiences may also find browser games unsatisfying.
Slither.io earns its 4.5/5.0 rating. It's absolutely worth playing โ especially given that it costs nothing and requires nothing to try. Play 3 sessions before making your judgment.