I have been going thru the responses and would like to state my point of view.
Most of us have mentioned the names of starts we do not like as over-rated actors. Have we ever wondered how many allow our "stars" to become actors. An Amitabh does a "Main Aazad hoon" or an "Aks" or a "Nishabdh" and we pull him down.
An SRK does a "Swades" and we give it the royal ignore. A Rajnikanth does a "Raghavendra Swami" and we ignore it. Dust the cupboards and you will find instances for any actor/actress.
When we do no appreciate the efforts put in by actors to etch out decent characters and turn in good performances and patronize their body of craft that does not require effort from them, how on earth do we expect them to grow as actors.
We want them see them as stars, the moment they want want to become actors, we have a problem. They go back to being starts and we rile them for not being actors.