It's a bit annoying, but even as a pure melee, it wasn't too bad. Just gotta be weary of whats around you and pull enemies to good locations. (So the casters don't get you..)
Never had a problem with Shrine of Amana, even solo and even pre-patch*, to be honest. There's plenty of ways to handle those enemies.
Just yesterday I played this area with a friend and it was really fun.
* In full disclosure, my first character was a dex with a good bow, but I can deal with it without a bow too.
Is not like it took me that many tries as a pure melee, I died 4 times or so for the whole section, but I think is just an unfun area. Being constantly chased by pew pew spells, the speed of the dudes in water when your movement is afected unlike them, the range of aggro on the casters, etc...
I'm not having fun, I'm getting annoyed everytime I do that level, in contrast Anor Londo is terribly more fun for me.
I never co-op or summon NPC on DkS games, but DkS2 has several areas that in no way I want to do alone, not because they are "hard", but rather they a pain in the ass, undead crypt swarm of ghost area is another infamous one for me.
Sometimes I feel that some areas in the game were designed with co-op in mind.
That aside, I think that the most fun I have on souls game is pure melee: no ranged shit, no shield, only your big ass sword and your rolls.