Pastor MacArthur is a sincere expository teacher of the Word of God. The criticisms I have read seem "over-the-top" based on my exposure to him, ranging from accusations he rejects "supernatural gifts" (I would assume his belief of Jesus' resurrection would count), Bob Jones being the most backward and racist bible college in America (3 of our 6 pastors are graduates and our congregation is very diverse), to "he says he is an expert on denominations (I would like to see where that claim was made, actually I would like to know if anyone has ever claimed to be an expert on denominations), to even one saying he is "out of his depth" and illogical (I can only assume because he expounds a different opinion).
I have studied, listened and watched a lot of media he has produced and I have yet to run across any thing that validates that he believes he is anything but a teacher/preacher of the bible. He does not hold himself out as a prophet, apostle or perfect man. He freely admits to not being able to understand everything about God but uses his constant study to answer the questions on his mind and preach on it to his church and throughout his ministeries. I agree, MacArthur is not perfect and is not God but some of the criticisms here are not right-at all.
I'll sum up with what I think speaks to his charactor. I ordered his commentary on the John's epistles and added a small donation to his ministeries. The letter I received started out by thanking me for the gift but reminded me (in the first paragraph) that my first priority was to support my local church. I would also note that he makes no promises regarding "sowing seeds", "financial rewards", "personal success through self-esteem" or other passing but historically failed philosphies. He mostly uses biblical teachings that have stood the test of time. Regardless of your opinions of him or any others, don't let anyone or anything keep you from God or the things we know we are supposed to do. God Bless.