The beauty of general relativity (GR) lies in the connection it provides between geometry and physics. Weinberg's algebraic approach completely obscures this connection. Instead Weinberg teaches how to crank through complex calculations without any insight or geometric intuition. It is a fairly good book when compared to Misner-Thorne-Wheeler (another ancient text). However, by modern standards, Weinberg's book leaves much to be desired. Having been published in 1972, the book lacks modern examples in cosmology and quantum gravity. It also lacks a proper introduction to differential geometry and makes no mention of topology or other mathematical ideas prevalent in current GR research. In the 35 years since its publication, it has been surpassed by many much better books. For an excellent introduction to GR, read Carroll's book. For a more rigorous study of GR read Wald's book. For an easy introduction to GR, read Schutz's book.