Among those dropping their quarterly forecasts:MCDONALD'S

On Jan. 16, the chain, which had badly missed estimates for two quarters, changed strategy and called it quits.PEPSICO

In February -- two months after Coca-Cola discontinued its projections -- Pepsi followed suit. Pepsi is doing well.MATTEL

After overly aggressive projections contributed to his predecessor's departure, new CEO Bob Eckert abandoned even vague earnings forecasts.