Sign of the Cross 

I would call this a little more stiff than V3. I started at the undercling and found it to be about the harder V4 range. Even a soft V5

The V scale was originated at Hueco by John "Vermin" Sherman, et al (note the V of the nickname). His now older, but very thorough guide to Hueco clearly states "The standard problems for each grade are here so nobody can complain that Hueco Tanks problems are over or under rated." The Verm lists Sign of the Cross as THE standard for V3 in his explanation of the scale. No doubt Sign of the Cross is burly, but no matter what V3 may have become elsewhere, Sign of the Cross is V3.

I have no idea if Sign of the Cross is soft or hard, but....

...while Verm's notion is quaint, rock breaks, holds get polished, new sequences are discovered. Route grades are not steady-state, they change over time. Some routes get harder over time, some get easier (some stay the same?).

hard to say on this one, within the vicinity theres skimmer (V3) and sign of the choss (v4). this climb is surely harder than skimmer and definitely easier than choss..

dude this is not even close to a v5

your ego has probably just been sorely bruised from Hueco Tanks... Its ok - it happens to everybody

You gotta remember that the V grading system was invented here - like Randall said. Its V3, period..

Those moves are not 5.12a (V4) - its just deceiving because all the holds are very uneven. If your unsure - cruise the line about 4 or 5 times, get the beta down - and then I think that youll agree its V3.

Definitely V3...I think you'll see why if you read Verm's book "Better Bouldering" where the V-scale is explained. The mental aspect and the sharpness of the rock should not be taken into account (that 2nd hold hurts); so just the physicality of the movements is V3.