These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Valkyrie Profile 2 Silmeria
8.8: GameSpot's review. It's not so much the score that's the problem, it's the content. It's not necessary to powerlevel if you make use of what the game offers.
Game Breaker: The combination of the Blue Gale bow (guarantees every hit will be critical) and the Dismantle skill (critical hits break whatever body part they hit). It doesn't work on bosses, but for most encounters, it allows an archer to tear through the enemy, killing them in a few hits regardless of their defense and the archer's attack power.
The game also includes a few deliberate Game Breaker weapons, provided you overleveled a few plot-important characters before the points where they leave the party. Of course, the levels they need would have broken the game anyway, so this is possibly just the game's way of compensating you by providing your remaining characters with another way to break the game.