[Abhey]

Some of the companies that might be good value investments have questionable ethical principles (e.g. tobacco companies).
Secondly you have to be careful, sometimes a seemingly undervalued company is going to keep on going down.
With these two caveats, value investing is probably one of the best ways to go. Like all investment strategies it carries a risk.
And GeminiX: if your research tells you that the investment you have in CSCO could make a better return somewhere else then sell, take the loss and move on. It's a pretty common pyschological flaw that we don't like making our losses concrete and thereby end up losing more in the long run. It may be uncomfortable but it's often the right thing.