So here's my opinion and personal feel for how paladins tank/have tanked in the past. Keep in mind, I am not level 60 on Pld yet, but have played PLD in 2.X series off and on.
I have ALWAYS found Shield swipe to be gratifying, maybe not in the damage it deals(which is decent though technically a loss at this point) or how it can feel clunky when trying to fit it into the combo in its fairly short window. However it is oh so sweep to light up the area as you Backhand something with your shield. As I see it right now, paladins have a couple pseudo-issues depending who you ask.
1. TP drain- They run out part way through fights.
2. Damage issues- ? too low in comparison to other tanks (again dont flame, depends who you ask.)
3. Shield Swipe dps loss- Its an overall loss to use it.
4. ^ Too clunky- feels like forever waiting to finish off that combo post swipe.