Is being d2 (d3 peak) with 300 hours good?

I have a total (not just in game) of 300 hours and I peaked at d3. when I started playing comp I got placed right into plat 1 div 1 so I skipped all the ranks below. The reason I feel like this is slow is because I reached d2 at 170 hours and have been there since then, which means I haven't ranked up to champ and its been over 100 hours. How about you guys? What do you think?