There are plenty of simulator tools like NS2, Castalia, OMNEST/OMNeT etc. Which one is widely being used in the research community at present? What are the pros and cons of each of these simulators? Also is it true that NS2 simulation results aren't accepted in good conferences and journals anymore?
The best you can do is to search for comparison papers. Every simulator has its own strong and weak aspects. Surely, the active community, flexibility, usability, easy use, support, license free, and bunch of available protocols, that you can simply take and use, are all the most important features you will be looking for.
From my own experience, I cannot say the name of the simulation tool you use to evaluate your algorithms plays a significant role in appreciation of your results. Basically, you can take any tool incl. NS2, NS3, OMNET, OPNET, etc. for evaluation of routing and MAC protocols. Even programming your own proprietary simulator would work fine. However, using a simulator will definitely save your time and help other researches to compare their own results to your results, especially if you can share your code with others.
NS2 simulator is definitely a simulator that is currently in use. In my opinion, its community decreased in the last years. But you can still use it and get trustful results.
I'd rather recommend to use OMNET++ or OPNET, just because they are widely used for these purposes.
Good luck.
Yes, even I have been told that NS-2 results are no longer accepted for publications in reputed journals since its not been actively maintained since 2009. People are now using NS-3, but that doesn't have libraries for many of the protocols.
NS2 ... well proven ...open source code ... good documentation ... extensive support already built in ... results reliable ....universally accepted in Research Community
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