Why are people saying that GaGa is "flopping."

And already predicting her new era won't be successful... smh... This is only her 2nd full length album. Lady GaGa is new compared to Rihanna... Rihanna hasn't even made 1/4 of the impact she has made in such a short time...
If Rihanna was such a huge star she would be attracting much more sales in her first week... It shows that she does not have a huge fan base in the US, but is able to attract the casual album buyers due to her success of her singles. No hit single for Rihanna and it's basically over, while others can still sell units on their name alone.