Depends on how much of a coffee fanatic you are.
Some people just like having fresh ground beans. It definitely has a fresher taste, and the aroma of the grind is an added bonus.
That said, basic blade grinders do not grind the beans evenly. Some grinds come out large and some come out like dust. The blades also get hot and cook the beans. Many people don’t notice this and are just fine with it.
However, more advanced coffee drinkers find the uneven grinds to give off an odd, bitter taste. The solution is to buy a burr grinder. Burr grinders as well come in many levels, with the cheaper ones not grinding as evenly as the more advanced ones.
I personally found a $25 burr grinder on Amazon that works well for me, but the cream of the crop is the Baratza Encore, which runs for $139 if you have the extra cash and are in the mood of spending.