More could be done to live up to Open for Business's great gameplay.
In Sims 2 Pets, there are NO new neighbourhoods at all. Even the two to three supplied houses (that came with pets) were not sufficient to allow any player to dive straight into the game. And even if you may complain that there are loads and loads of options available in Create-A-Pet, the game will just about get worthless from there. Having said that, what I do feel is the Create-A-Pet is the most superb gem in this expansion.
Even by integrating Pets straight into the neighbourhood, there are not many options you can interact with your pet, and interactions will not cause any significant difference to your Sims' lives. By making pets uncontrollable, it increases the difficulty and multi-tasking required to play the game smoothly. Having pets in your household also does not seem (in immediate effect) to improve your household.
Even those keen on making storylines with Sims 2 Pets will have problems as there is no way to completely control your pet, as there is not even a cheat to change behaviour (however, there is a cheat to allow pets' actions to be cancelled). For storytellers, it may just be difficult to create masterpieces with Pets.
This game is also pretty empty as compared to other EPs. In University, you get a whole new college area and new age group. In Nightlife, you get a Downtown area and cars to complement your Sims' lives. In Open for Business, setting up a business provides more diverse gameplay compared to having Pets alone.
Of course, as with any Sims EP, by having older expansion packs will increase the value of the expansion. One notable mention is the great integration with existing custom content, which is a great thing as older EPs had problems with Custom Content. All in all, I feel that this expansion could have be more improved to live up to its predecessor, The Sims 2 Open For Business Expansion Pack, which offers more gameplay and deeper storytelling to the Sims 2.