Actually I can play her just fine on any difficulty with a variety of weapons. I played her with an Eviscerator while recently completing shotgun mastery and still got above 200k on an U/U/G game just fine. There is nothing wrong with the kit except for the lack of broken mechanics to exploit. Not every engineer has to have an "I win" combo that works on all defenses and requires the massive skill of pressing two buttons in sequence. QFE has a fantastic debuff, a good offensive power (that includes a spec which synergizes with the same debuff) and situational but useful pet. It is precisely because of her lack of natural combos (other than cryo on health and lolflameturret), low cooldown debuff and turret which isn't reliant on cooldowns that I find her to be an ideal engineer for heavier weapons such as the Claymore
I could just put some tiny caster gun on her and spam cryo combos as you and every other "weapons R bad hurrdurr" person on this forum suggests, but then what is the point of playing her over the Paladin? I've found something that she does uniquely well in the engineer class and that's what I like doing.
So because some krogan makes youtube vids he is now the authority on how to properly L2quarian? My QFE has been a shotgun toting badass for as long as I've played the kit and before I started posting here. Besides, anyone can aim a claymore with a mouse, keyboard and a framerate above 1 per second. I'm the quintessential PS3 claymoar quarian and therefore the best one
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Infiltrators were broken before any weapon power creep took place because of cloak and its ridiculous cooldown override of every power and weapon weight loadout. Besides, what do you mean by "no teamwork whatsoever"? Does this include every powerful caster kit that can make its own combos at will, in particular kits like the Fury, Vsent, Valkyrie, DA, Paladin, and QME? Perhaps the original AA that now tops the Plat solo HOF leaderboard? What about the invincible vanguards that have been around forever like the Novaguard, Drell and Krogan? I hardly need teamwork with any of those on any difficulty to singlehandedly wreck every enemy on every wave, and unlike an Inflitrator I won't even need a decent weapon with most of them (or even a weapon at all.)
I'm of the opposite opinion. It isn't guns like the Claymore that break the game (it has great power but also proportionally heavy weight). It's the zero weight pistols and SMGs that are now more effective than most of the heavy weapons even on dedicated weapons platforms (Talon/ Hurricane GI/TSol or QMI Arc pistol anyone?) because the caster types couldn't stop crying that they needed both top tier weapons AND 200% cooldowns at the same time to compete with the irrevocably broken Winfiltrators, which ironically just made the latter even more broken.
When weapons were weaker, infiltrators were proportionately weaker because they rely so much more on their weapons than any other class. A human or salarian infiltrator with a claymore was nowhere near as bad as a geth infiltrator with a per-nerf piranha, for example.
I don't think the claymore is a game-breaking weapon. It's strong, but the encumbrance is hefty. That's a fair trade. My point is that it's a gun that's good with any kit because it's so powerful, and takes away from the power side of things because of those cooldowns. I'd be just fine and dandy with there being no PPR, Wraith, Hurricane or other super-guns. I agree with you that those introduced a lot of roadblocks for balance.
Where the top-tier infiltrators differ from characters like the Drelldept, Fury and Valkyrie is that they are high damage-dealers and extremely survivable and low risk characters. Seeing someone take a piranha or talon GI or a PPR/Harrier TGI or Reegar AIU makes my heart sink because where's the fun? Where's the challenge? You do a ton of damage no matter where you aim, enemies ignore you, and you can either shoot from across the map or there's no consequences if you get hit.
When I play Drelldept, I may be able to do detonations on my own, but I'm not shoehorned to play that way. As easy as it is to take top score, if my teammates want a team game and not a "stand in the corner while I do everything" game, I'll be content to detonate their powers and just help them along. If I'm an infiltrator (barring the huntress) this really isn't an option, because the only option is to shoot things or do nothing. I'm just of the mind that this being a co-op game, working with the team takes top priority, making the game more fun for them by helping them make a bigger contribution to the team's success. I know that a lot of people enjoy that, so that's my real "objective" in each round that I play.
On the other hand, if they pick a lame class and loadout and clearly are skilled enough to not need that to get a decent score, you can bet that I will happily nuke all possible spawns with my drelldept.