Yes, a little, but I think the reason is that he sometimes has the bad habit of wasting some of the good Devil Fruits on the weak or minor characters.
For example, Akainu's Devil Fruit is essentially just a much stronger version of Mera Mera no Mi. If Akainu was introduced before Ace, I'm sure he would have gotten fire powers instead, but since Ace was introduced with them long ago, Oda had to invent some stronger for him that was still linked with the color of red.
And you could argue that Whitebeard's fruit is too similar to Kuma's fruit. Whitebeard makes earthquakes with shockwaves, and Kuma's fruit is also about producing shockwaves (by pushing the air). If Kuma honed his powers enough, he would probably be able to cause earthquakes too, but still Oda gave Whitebeard this power in its pure form.
Also, I wouldn't wonder a character with a stronger version of Mr. 5's Devil Fruit appeared in the future. That fruit was too powerful to be wasted.
But there are still being introduced new fruits with simple powers that Oda makes creative (e.g. Magellan's and Kizaru's fruits) and just really creative fruits (Bege's fruit).