There are those way say that the 5th installment of the Die Hard franchise was the worst of them and some would even say it's not deserving to be a part of the franchise, but I look at it differently.
Bruce Willis was 31 when he started filming "Die Hard" and by the time the 4th installment came around he was 48. With the 5th installment he is now 54 years old and although many of us want to see him like he was in Die Hard, clearly that's not possible. He's older, perhaps a little slower both mentally & physically and all his character (John) wanted to do was to reconnect with his son who was on trial for his life in Russia. So initially we think that not only was his daughter estranged to him but now we find out that John Jr. was also estranged. We learn that while Daddy was out kicking butts the children more or less grew up without a father figure. This is something that John Jr. overhead his father say in the movie. While John screwed things up for his son, as time goes on we learn that the son really loves the father and the two of them are off to "save the world".
In this light, A Good Day to Die Hard is fitting to be a part of the franchise. John is human and can't be kicking butts all the time, but he shows he still has what it takes in this film. I read that there may be a Die Hard 6 and that Bruce said will be different from the previous 5. At 62 perhaps he'll be passing the baton. Clearly both of John's kids are more like their father.
So I actually liked the 5th installment. It was different but a nice way to end the franchise if they choose to do so.