Don't really have an opinion on 'Combat Superiority'... but I will say I'm not a fan of the term 'Deadly Strike'. Especially when it sits next to 'Parry'. Take off the deadly part, and just make the two uses of expertise dice 'Strike' and 'Parry'.
That is my naming convention whine of the day.
This is a pretty small issue, but nitpicking is what we do here, right?
Anyways, does anyone else feel this way? Other class features like "sneak attack" and "rage" are quick and to the point, not the eight syllable monstrosity that "combat superiority" is (nine syllables, if you say combat superiority dice). I guess you could abbreviate it to "CS", but my group rarely abbreviates stuff as it makes things a bit too gamey.
Anyways, just sayin'. They should rename it to something shorter.