Is Artillery Still Relevant??

YES and NO

YES. Nothing conventional delivers more blast effect and shrapnel at less cost than artillery. 

YES. Technology has improved the accuracy, range and effectiveness of the artillery family of weapons.  

NO. It depends on your adversary.  United States forces for example can return counter battery fire while enemy projectiles are still in flight. 

NO. Most anti-aircraft artillery is obsolete with the advent of shoulder fired and other more effective anti-aircraft rocket systems. 

NO. Other than tanks, most anti-tank guns have been replaced by more effective shoulder fired rocket and other types of anti-tank systems.