The acting in the film was outstanding from the main actors to the supporting cast. Bill Murray as Dr. Peter Venkman was great as the goof off of the group, and had some of the best lines in the movie. Dan Aykroyd as Ray Stantz was a scientist with the excitement of a child at times which made for a lovable character. Harold Ramis was good as Egon the no nonsense scientist, and his deadpan delivery of lines is outstanding.
Ernie Hudson was the "every man" of the group, and did a great job as the character everyone could relate to. Sigourney Weaver as Dana Barrett was great and had chemistry with Bill Murray, it made the relationship between her and Venkman seem genuine.
Verdict: Great laughs, acting and special effects all wrapped up into one outstanding film.