Definitely not as good as Raiders or the Last Crusade, but a good adventure movie nonetheless. If only Lucas could have restrained himself from the alien stuff it would have been even better.
I found this movie quite enjoyable. The dialogue was snappy and fit well with the period. It wasn't in-you-face, aggressive comedy as is very popular these days (and which I also enjoy) but it was very entertaining. The music and general atmosphere added a great deal for me.