If for no other reason, Baxter's catechism is excellent because he asks really good questions. Even if you don't agree with his answers, he does a nice job sketching out the key areas for an answer. Really good introduction with natural theology. Most of the exposition of the Creed, the Lord's Prayer, and the 10 Commandments are standard, though Baxter's views on justification and the atonement are quite eclectic and not necessarily great. Some of his detractors are probably harder on him than necessary, though I would say that I don't agree with him on his formulations of those doctrines.