Guest roles is plus or minus?

A song was filmed on NTR and Venky in Ramanaidu day before and for a half day yesterday for the flick titled Chintakayala Ravi. Is that story that bad which needs other actor? This has become customary to rope in popular stars to uplift the film when in doubt. It can be recalled that for Shankar Dada Zindabad too, a bunch of actors danced and jumped but couldn’t help in the box office collections.