I agree....but let me provide some background. I was a ski-tester for a ski-mag. I won't say which one, as don't want to bite the hand that feeds you...but in general here is stuff to consider.
Size does matter (where have I heard that before
: ), but things where so disorganized, becuase not only did you have the testers, but you also had all the ski shop reps there too, trying skiis so as to know what they wanted to purchase to sell in their shop. However I can say almost without exception the skis where 170cm (some abit more, some less, but generally they were 170s).
Other things too, was the test was done late last spring...it was actually my last day skiing for the year...so hard in the morning, slush by 11am. Hence some guys got to test the GS boards at 8am, some tested them at 2pm....that will give a huge difference too. Also the testers were never told what the ski was...and you were skiing (as you do) in a group, hence it is also possible you took a SL ski on a bump run, then being spring, and since you sometimes only get one run (sometimes more), you may have never really got the chance to see what the ski can do...plus as I mentioned, if you didn't get on them early, it was all slush anyway.
Other points...some skis where well tuned, others weren't. That makes a noticiable difference for sure, especially earlier in the day...plus, I have to admit, but 2pm, and you have been on your 17th pair of skis...it is getting pretty hard to tell the difference somtimes...I mean..."geez are these skis better at short turns then that 3rd pair I tried?"...you always tend to compare what is on your feet now...to what was on them just before.
Another point, some skis you really liked and gave them top marks, then your next pair was BETTER!...but you already gave away your top marks, hence you can't differentiate, even thou you wish you could now downgrade those other pair....
Having said that, my advice is, use the mags to cut your choice down to 2 or 3 skis...the good stuff does tend to stand out regardless...ie the "gold star" or the "editor's picks" or whatever...then make you final choice on gut, or better yet, your own test.