Instead of focusing on a specific numerical value, consider these aspects:
* Percentile Ranking: Pay more attention to the journal's percentile ranking within its subject category than the raw SJR score. A journal in the top 25% of its field is generally considered quite good, while a top 10% ranking is excellent.
* Field-Specific Comparison: Compare the SJR of a journal to the average SJR of other journals in the *same* field. This provides a much more meaningful assessment.
* Other Metrics: Don't rely solely on SJR. Consider other metrics like impact factor (IF), CiteScore, and the journal's reputation and editorial board to get a holistic view of its quality and influence.
In short, a "good" SJR score is context-dependent and requires comparing the journal to its peers within the same subject area. Don't look for a magic number; focus on the percentile ranking and the overall standing within the discipline.