According to this chart which I stole from Guardian.gg, Sunsingers have the second lowest KDR, which is equal to Nighstalkers. While Bladedancers have the highest KDR, gunslinger coming in second.
If it was really overpowered, people would be doing amazing with it and the KDR would be much higher. What this means is that the abilities are not strong enough to override skill, and therefore, not overpowered.
Edit: the purpose of the chart is not to call anything OP. All the stats are within 0.10, which is not that big of a difference.
The actual KDR value of sunsinger is 1.01 while bladedancer is 1.11.
All the classes are essentially equal.
NOTHING needs a nerf.
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While I agree that nothing needs a nerf, the fact of the matter is, one of the reasons that Sunbreaker got nerfed was because they want all subclasses to be around 1 KD ratio. Sunbreaker having a 1.06 was too high, with bungie logic the ne next 2 subclasses on the chopping block are Gunslinger and blade dancer. Which is total crap if you ask me because while I may not be the greatest player I still like challenge each subclass brings to the table when fighting them in pvp.