Ea don't do anything other companies don't do.
I love how people always jump on EA saying that any sequal is crap only because EA got their hands on whatever company it was. Its mostly, IMHO, game makers who had one idea, ran out, can't think up another one and while the first game rocked the follow ups suck as they have nothing new to offer, why EA should take the blame for that I don't know. Many other companies manage to produce a great game and a bunch of crap follow up's, its not an EA only phenomena, Doom, new and original, the rest, meh. UNreal, woo, follow ups, meh. Half life, fantastic, the follow up's, meh.
Sequel's are rarely better because, by and large you play yourself out on the first one and something following a similar story will inevitably feel too samey. Rarely does a sequel differentiate itself from its predecessor significantly. The few that do tend to do quite well, the ones that don't tend to get panned.
Matrix one, woooooo, matrix two and three...... tripe. Its a pretty good example, while the first was clearly long thought out and a very good story the follow ups were fast put together cash in's with ridiculous plot, awful scripts and focused just on being bigger and louder, so many games do exactly the same.