First off the ratings won't be affected by one encounter no matter what.....in the end it will be the overall game experience that matters. For me one of the most special and fondly remembered games that I enjoyed most did exactly this to me.....a little gem on the Xbox 360 called Lost Odyssey....early in the game trying to get to grips with the mechanic ran into an enemy that would stun my whole party, hit all, and repeat....I would get wiped without getting a single hit in....I was genuinely stuck, no clue what to do, nothing visible in the skills to help out or anything, dead in the water. Ended up looking up an online guide that showed me that on a previous map I missed a very well hidden chest that had a ring that gave paralysis immunity......my party was made of 3 "immortals"(NPCs who could learn abilities from equipped objects) and 1 "mortal"(couldn't learn from objects) so I got that ring and grinded out some low level enemies until my immortals learned, equipped it on the mortal and then the fight was cake. Was it a pleasant experience? No. Do I remember it in a positive light? No. But there was SO MUCH more awesome to that game that it was absolutely worth putting up with and experiencing the rest of that amazing game.....one of the best ever simply because of its story and atmosphere. If I had to rate it I would never give it less than a 10/10 because of how insanely amazing it was. Every game has its quirks but in the end it is the whole experience that matters.