(By the way ... for those dealing Lady Gaga crazy ... learn to write in French and will be more credible. In short.)
After Lady Gaga, love it or hate it, it is for everyone to see. Some might blame him her outfits, her attitude but I owe him this: I most enjoy myself watching Bad Romance rather than the video Ego Beyoncé (except when RuPaul song you put on top).
What I really like about Lady Gaga is the difference 'tone' between songs, words that can be either downright catchy or limit 'freaky' (for once, I think of 'Teeth' or 'Monster '). The worst would be that it musically happening speaking (because yes, Lady Gaga is music, no less) and that if we do not look at the words, it may be a little in the same style. I await his next album to make me a more thorough idea.
After, it may very well change over time (but I know of groups that have changed and are shunned by their more fans hardcore because of it. See.).
But to say that Lady Gaga has sold as many CDs just by marketing moves, it's a little strong coffee - and it would take people for low ceilings. (Mention for those who do not speak a word of English is not their fault.)
I only regret the absence (apparent?) Of a single CD for 'The Fame Monster' - it's painful for those who have already 'The Fame'. But then the idea is not bad at all for those like me who are still waiting for the last moment.
Go Little Monsters!