Cell was created from DNA of many fighters, like Goku, Vegeta, Frieza, Tien, and many more:] Cell actually used Frieza discs, he could control them even better than Frieza!! Actually as an Android Cell improved most of the attacks of other fighters! Like his multiplication taked from Tien, Tien's original multiplication divided his stats by amount of copies, Cell divided himself without loosing of speed nor power!! Cell is just like in the series, and BTW the three characters you mentioned probably will be in 1.3 soo don't worry about it soo much:]
EDIT:
BTW if you say Cell have most powerful attacks, and is tooo godlike then why you just don't play him? hehe he isn't more powerful than others, in ESF, characters are much different, but balanced! And Cell is perfect for me:]