nah it's just xanatos' nature to run into any topic and put in some horribly mispelled post about how much vegeta owns the world
kidding. Yet slightly not.
Cell is nice because he has a good mix of attacks. SBC is a great technique, because it charges fast, and you can fire and forget. Yet unlike piccolo, the owner of SBC, he has beam attacks with massive explosions like Kamehameha, but also beam attacks that charge fast (though are weaker) like gallit gun. His disc is nice too. However his transformation multiplier is terrible; 1.5x as opposed to the saiyans' and krillin's 2x. But he has good speed. Anyway it's all about how you use these... trunks has very few techniques, and they aren't as useful as many of the other attacks, and his stats are average. But people can own with trunks (and I don't mean only when he transforms before everyone else.)
Buu has high speed. Buu has healing. Buu has an HP max to let him take a MASSIVE beating before he dies. Mouthbeam is good. Candy beam is... fun. His transformation is late and his multiplier is bad, but feh, he can brawl with the best of them, just like ALL THE CHARACTERS if used correctly.
Bah, in short, all the 1.5x characters have a disadvantage when it comes to PL, but if they fight well enough, they can keep up. The 1.5x'ers have some of their own unique advantages (such as a great mix of attacks like cell, or high tolerance to smackdown like buu, or very unique and useful attacks like piccolo and krillin. Well krillin doesn't have 1.5x but he's a late transformer.)