Dragon Claws are indeed a pretty cool weapon, and not too hard to get if you do colosseum stuff, and especially if you do bunny races~. Critical hits feel a touch overrated based on my testing so far, but I'll reserve judgement until I'm done. Still, no real question that Meracle should end up pretty good on damage, possibly even the best. I don't think it's by enough to justify her weaknesses in other areas (you brought up her durability but I think the lack of range or crowd control is a bigger deal, she doesn't really do much besides punish single targets and even that relies on risky maneuvers). That said this is one of the really good things about SO4: despite the fact that the characters play very differently there's very solid overall balance, such that depending on what you're looking for almost anyone can be good. (not sure about the NG+ PC)
Dark Souls - Beat some wolf with a giant sword, this is by far the coolest enemy design Dark Souls has come up with. He was pretty easy though, by DS boss standards (which is to say less resets than anything since Capra Demon). Especially once I realised I had some ring which jacked up three key stats a whole bunch in exchange for... my not being allowed to remove it or it breaks? I can do that. Going through the Duke's Archives, died to some plot fight apparently. Dum de dum. So far Fudo's statement about the harder half of the game is not being born out!
FE7 HHM - Okay, the game gets harder around Pirate Ship or so, pretty legit stuff there. Currently up to Kinship's Bond, the defend Nils map. Raven is so broken.