Really? What exactly made you change your mind?
That's not reality, that's 1. way too rude for this forum, and 2. your personal opinion.
What makes you think the newer ESET products are not light and effective?
Do you have any numbers, such as benchmarks, and comparisons between versions and OS, to back up that statement?
1) New versions every year improves the product and I appreciate the new features.
2) The GUI has been consistently similar since Version 4 was released in 2009.
What are your suggestions then, as to how to improve the interface?
Tablet devices sales have risen dramatically and are close to surpassing PC sales. 
You should expect more support tickets involving touch-based windows devices.
With this reality in mind, it is necessary to optimize the interface for desktop and touch-based operation.
Otherwise in the future, there could be complaints on this forum about the interface being old
and hard to use with touch input.
I'm sorry you've had this experience. However this is still a beta product under development.
Can you share with us your ideas for improvement and which GUI views are bothering you?
I've yet to read a single clearly stated suggestion from you.
Again, be respectful. There is no need for lecturing people. Please share your list of suggestions so that we can discuss them accordingly.