While I get the comparison, I don't think it actually works in this situation. A game, especially one that is based on math, like Civ is, can be calculated out and number crunched into strategies that work better than others. Where as, 50 Cent sells albums, because some people like him, and other people buy it because they were sold a product. Imperialism isn't really a product to be sold. So where as some people just like the imperialism trait, having fast settler production and better chances of getting a great general are not that powerful. Though I would say Great Generals and the charasmatic trait have potential, but it's not game breaking. The fact that imperialism is considered a second tier or third tier trait, is only because there are better traits that probably stack the odds in your favor better than others.
However, to answer the more important question...
No, 50 Cent sucks.