I actually like DT lines for anything 4wt or smaller. I cut a lot of them in half and store the other half for later. Don't find a big casting distance as everything that small is dries usually.
Too me, line ratings are a 'recommendation'. Try them out with different lines for different situations. For my 2 wt, I use a 3 and 2wt line evenly. For bigger waters where I'm making longer casts, it's a 2 wt. For small creeks, it's a 3 wt.
Have a rod I also didn't really like much as a 4 wt...little sluggish for how I wanted to use it (for me), but when I put a 3 wt line on it...it made all the difference in the world. Also have 10' 3 wt (Dan Craft FT) that fishes really well with a 4 wt line.