One of the biggest misconceptions is that a simple logo takes less time to create and is also least expensive. Based on my experiences in logo design, it is often the simplest logos that are the toughest to complete.
One of the main reasons it is so tough to create a simple logo is that there is less object to work with and as such so much more attention is given to the final product. Every single line, box, shadow, and colour is therefore that much more scrutinized upon completion.
In fact, some of the most well-known and easily recognized brands in the world tend to have the simplest logos. Take for example, Apple, Pepsi, 3M, Target, and McDonalds. All have logos that are extremely simple and easy to recreate, yet these brands tend to be some of the most well-recognized companies in the world. Yes I’m sure their strong marketing campaigns have a lot to do with it, but there’s no doubt that a strong logo is the foundation for a successful marketing campaign.
I find that the best logo designs are those that are the most simple. They are easy to recognize, memorable, easier to work with and most likely the best branding strategy for your business.
yorkscene 
Yes, I’ve been involved in logo designs in the past where the client asked for complex additions to the art and I also explain that sometimes, the simpler and cleaner, the better. The Pepsi logo can be put on any media at any size, and can easily be recognized. Other noteworthy logos include Shell and Nike.