Sims is a sandbox game, it's not meant to be difficult. It's pretty difficult as it is for new comers. It's not a game with an end game that you have to achieve. No matter how difficult they make it, someone will come along and claim it's too easy. Everyone has their own idea of what is and isn't easy.
Personally, I think it's just right. It I want it to be easy, it can be. If I want more of a challenge, it can be that, too.
There is no one way to play. So if you find your style of play is too easy, try a different approach.