Specifically for this build, focusing on level 11.
Compared to a single class Paladin you are quite a bit behind in DPR (that accuracy from not max str/dex hurts).
With Steady Aim and Elven Accuracy I am more accurate than a Paladin generally I think. I can't use it all the time of course, but I can use it a lot, enough that overall accuracy will be better than a Paladin with +2 more on my ability I think.
I don't think I am behind in DPR on average, but I would be at times.
If you look at DPR with a 20 dex and a d8 weapon a Paladin at 11th level is doing 4d8+10 with improved divine smite. Against 17 AC that is 19.8DPR and he will pretty much do that all day long.
With a 16 dex I would be doing 3d8+2d6+3 with sneak attack. That is 14.0 vs AC17 without considering Elven Accuracy-steady aim, psychic blades or secondary cantrip damage.
With psychic blades alone that would be more than a Paladin at 20.35, and that is still not considering EA advantage or secondary cantrip damage.
If you consider Elven accuracy now you are looking at 35.3 and if you consider GFB secondary damage on top of that it would be 46.6
So to really compare you would need to know how often you will use psychic blades (most of the time you hit?), Elven Accuracy (fairly often?) and GFB secondary damage (occasionally?). If it is like I estimate in paranthesis, I think you average significantly more DPR than a single class Paladin.
That is without using divine smite. So some rounds the DPR would be worse but I think on average the DPR will be higher that a single class Paladin at 11th level without using divine smite, and when you consider divine smite you have an extra 4th level slot on top of that.
, you have level 4 slots vs his level 3 slots. However, you have no nice defensive feature
also get nice defensive features on the rogue. Evasion and uncanny dodge are nice, the bonus you get at 10th can mean something like resilient wisdom.
where I'm at is that your build keeps up well enough offensively, but defensively it does fall behind.
I will have plate armor, the shield spell and the ability to resist all damage for an entire round 4 times per day with blessing of the Raven queen at 11th level (albeit at the cost of steady aim) while still having a reaction for shield. That is pretty good defensively I think.
I don't think a Rogue is nearly as good defensively. Uncanny Dodge works on a single attack only and since it is a reaction you can't combine it with shield.