You have two types of difficulty when it comes to patenting which are Procedural and substantive.
The procedural includes jurisdictional differences, due dates within the procedure, formatting , etc.
The substantive part includes validating that all elements of the invention are considered and compared against know literature. that the description of the invention has the appropriate level of depth so as to be realisable in principle, etc.
Could you be more precise on where do you want to focus the discussion?
To achieve a patent right is not so tough as Bangladeshi people believe. Yes, there is procedural/systematic complexity here but if you understand the path/system, then you must say, it is easy.
However, 3 granting criteria for achieving patent right (IP) of any invention/innovation are: (1) Novelty, (2) Inventive Steps and (3) Usability of the product/invention . That means, if your invention/innovation at least one novel feature, the invention steps are unique/novel and the invented/innovated products have certain business value, then this invention/innovation is suitable for patent right or IP right.
Being a native Bangalee, hope the following article will help you for better understanding about your question.
You might want to take the Utility Model route which is quicker and easier to register than Patents.
In general, compared with patents, utility model systems require compliance with less stringent requirements (for example, lower level of inventive step), have simpler procedures but they offer a shorter term of protection which is subjective to what you define as long term of protection. The duration of protection vary from one country to another for it is designed primarily to respond to the needs of local innovators, requirements and procedures for obtaining protection. I will recommend that you inquire utility model provisions with your Patent Office.
In some countries, a utility model system provides protection of so-called “minor inventions” through a system similar to the patent system. Recognizing that minor improvements of existing products, which does not fulfill the patentability requirements, may have an important role in a local innovation system, utility models protect such inventions through granting an exclusive right, which allows the right holder to prevent others from commercially using the protected invention, without his authorization, for a limited period of time.
I agree that it is a long and difficult route (and costly). However, the right that you obtain after grant of the patent is powerful: you may exclude all your competitors from market access for a period of time.
Further, other IP rights, like copyright and design rights are easier to obtain.
One thing no one has mentioned is that a patent, by itself, does not guarantee IP protection. Only if the patent survives legal challenges will it truly provide IP protection. At least, that is the way it is in the United States. Any invention that is commercially important invariably gets challenged in the patent court, e.g., the laser, the integrated circuit, the computer, etc. One can, of course, simply not patent the invention, but, instead, keep it as a trade secret. This alternative approach works well for things that are hard to reverse engineer. As Bart van Wezenbeek mentioned, going the patent route is expensive, and it gets even more expensive (and time consuming) if the patent is challenged. Fairchild Semiconductor and Texas Instruments legally challenged each other's integrated circuit patents for approximately 10 years - I believe - before simply cross licensing their respective IC patents. I would suggest reviewing your invention with an experienced patent lawyer.