On the other hand, I have also seen posts calling for DCI to be nerfed coz 1 player complains that he can't hit the another guy.
The thing about the bloody RNG is that people pay more attention to it during streaks of unlucky rolls that happen to themselves. So these situations tend to stand out. You would rarely notice it if the other guy missed you 3 out of 4 times would you? But that will be noticeable to the other guy and he'll think that DCI is overpowered.
Unless the recent patch broke something, the DCI, HCI and HLD, HLA properties themselves are pretty balanced.
Over capping DCI will make you HLD proof. HCI can similarly be countered by HLA. The problem for battle btwn warriors and mages in this case is like what War mentioned, mages don't have a way to deal hit proc effect (and specials) like HLA with spellcasting. Though most warriors would also overcap their HCI against this (and moving shot penalties).
Of course, some may argue that this balances out as spells do not miss. Against this, I would argue that spell casting requires you to stand in 1 spot, every swing requires mana, you can be interrupted, no autodefend etc.
I would gladly trade that never never-miss ability (ie give spells a chance to miss), to be able to move while casting, that plus weapon specials to be applied to spells, plus hit proc effects.
Back to the OP's issue with being hit. The math of it is:
You and your opponent have 120 weaponskill each, that makes your chance to hit each other 50/50.
Your 70 DCI renders you HLD proof. Hit chance still 50/50. (Without HLD proofing, you will be hit more that 70 percent of the time).
He has max HCI (45, assuming archer overcaps HCI to negate moving shot penalty) against your max DCI (45). Hit chance still 50/50.
So even with your 120 wrestling and max DCI, he still has a 50 percent chance to hit you. Having him hit you 5 times consecutively is like flipping a coin 5 times and have it come out heads all 5 times. It is easily possible. And more frequently than you think. Only over a large sampling will you see that you will miss once for everytime you hit.
To see for yourself, get your guildie, create 2 chars with 120 weaponskill/wrestling on test. You with 45 HCI 50 HLA weapon and your friend with with 70 DCI, then test trying to hit your guildie for an hour. You will notice there are streaks where you miss several times in a row, and streaks where you hit several times in a row.