Updated from 8:58 a.m. EST to provide analyst comments regarding earnings in the tenth paragraph.NEW YORK ( TheStreet) -- The launch of the BlackBerry ( BBRY) Z10 didn't go as well as some were expecting. That has caused several Wall Street analysts to rethink their positions, with one research firm even downgrading the name. Goldman Sachs analyst Simona Jankowski removed the Waterloo, Ontario-based technology firm from Goldman's Americas Buy List due to a disappointing launch at AT&T ( T); the overall consensus had moved higher on BlackBerry since Goldman added the company to the Buy List in late November. Since the Nov. 29 add, shares are up 34%, compared with a 10% climb in the S&P 500. Jankowski downgraded the stock to "neutral," and lowered the price target to $17 from $19.