The show dates back to the epical age, it's relevant in the contemporary context. Karna in this show stands as a symbolic representation of misuse and abuse of talent. No wonder, other characters like Arjuna, Bhima and so on too were equally powerful, but destiny and politics did not act so much against them to to dim their talents as in case of Karna. Karna is a sad representative of many such genuinely talented people who do not reach their deserved positions in life either due to politics of money or politics of reservations. Simultaneously, the show inspires us not to complain about our misfortunes every now and then but to strive to do our best from whatever position we stand in. Hence I admire the show and the thoughts behind it's creation.
All the same, there are some objections with regard to the portrayal of Karna. The character has been over exaggerated on many occasions. Every single minute, he keeps speaking about justice and equality to the point of exasperation . He supports the pandavas who don't tolerate him a single bit. He worships kunti who thinks only about her five sons. He foils every plan of duryodhana claiming them to be evil while it's true that it is duryodhana alone who supports him, gives him a voice and the stature of a king otherwise he would have forever remained a sutaputra. All these are highly wierd, and not in line with what has been written in many other versions of the Mahabharata