Just remember: You cant block magic on this game. So, dont matter how much block and evasion you have: if you find a magic, he will brutally kill you, and you have no defense except some 3% from your equips.
Other thing that make life of swordsman harder is the delay. The moment you use the skill of defense need to be much before the hit happens on the animation (we are talking about not magic hit, magic is unblockable).
About the stats, its true what he said when comes to PVP:
If you put too much low in CON, you end with low hp, and easily killed by a player with top upgrapes.
If you put too much low DEX, you cant hit another player with skills of swordsman, specially if the player use High Dex on the build.
But if you put All on CON and Dex you lose on STR, and then you will hit and have more chances of survival, BUT, you will kill no one. Other people will be needed to do that for you. Generally skills have more chance to hit the enemy, much more than normal attacks, but even the skills can receive dodge with low Dex.
So, is a “no end” point.
So keep it like you said, and test with someone at the same level as you. If you try to test with someone with 50 lvs more than you, you will get much more miss.
What you want to do on PVP? Attack? Tank for another players (but need to run from wisards)? Be captain america and attack with the shield? You chose and the Stats come from this.