Well sure...everyone SOUNDS op when you only list their strengths.
Tryndamere: -Passive-Free crit, wtf!?!? -Q-Free damage (sync with free crit, double wtf!?!?) and free heal with no cost -W-Huge AD and sometimes MS debuff -E-Spin that has decent AD ratio and 1:1 AP ratio that goes through walls and CDR on crits (which he gets for free). -R-Puts your crit/heal meter to full and lets you live for at least 5 sec no matter what, OP to da max!!!
Fiora: -Passive-Free decent regen in lane that stacks on itself -Q-a double gap closer that adds stacks to her E -W-Huge free AD and reflects dat crazy Trynd or Nasus crit? OP... -E-Huge AS and MS buff -R-Invulnerability and dealing massive damage to the whole team? Redonk...
One more... Sion: Passive-Damage reduction chance? Whoa... -Q-On demand stun with ridiculous AP scaling -W-Huge shield that also does damage as long as you have 1hp worth of shield left? Daaaaaang son.... -E-Huge AD for very low cost AND free HP that scales INFINITELY!?!?!?!?!?! INFINITE, SON!?!?!? -R-Huge AS buff and your lifesteal affects the whole team!?!?!? Whaaaaaaat?