I think you're talking about two things here (that by necessity overlap).
The first is the story, and I assume that this is the reason for the rec (I've never seen a fic recced for excellent use of a semicolon). This is where your judgment falls, and I'd like to know why you liked it, and what you didn't like/what didn't work. You don't need to go into spoiler-y detail, but just mentioning, say, that X and Y's characterisation was on the button, but A struck you as a little off; or that the ending was abrupt and unsatisfying; or that or that while MPreg usually doesn't float your boat, the fantastic plotting blew you away. Everyone has different squicks and triggers, and an honest rec is a way to make a good match (it's like arranging a blind date: yeah, Helen's a real sweetie, but the person you want to introduce should know she smokes / swears like a sailor).
The second part is the technical aspect (the spelling, grammar, punctuation errors). I appreciate warnings for that because I get more squicked by missing commas than, ah, MPreg; though I will grit my teeth and plow through if I'm told the payoff is worth it. I have made corrections to fics after being prodded by reviews *g* Some stories are also really hard to read due to freaky formatting: I find it very frustrating to click a promising link only to find tiny grey letters on white.... /TMI
no subject
The first is the story, and I assume that this is the reason for the rec (I've never seen a fic recced for excellent use of a semicolon). This is where your judgment falls, and I'd like to know why you liked it, and what you didn't like/what didn't work. You don't need to go into spoiler-y detail, but just mentioning, say, that X and Y's characterisation was on the button, but A struck you as a little off; or that the ending was abrupt and unsatisfying; or that or that while MPreg usually doesn't float your boat, the fantastic plotting blew you away. Everyone has different squicks and triggers, and an honest rec is a way to make a good match (it's like arranging a blind date: yeah, Helen's a real sweetie, but the person you want to introduce should know she smokes / swears like a sailor).
The second part is the technical aspect (the spelling, grammar, punctuation errors). I appreciate warnings for that because I get more squicked by missing commas than, ah, MPreg; though I will grit my teeth and plow through if I'm told the payoff is worth it. I have made corrections to fics after being prodded by reviews *g* Some stories are also really hard to read due to freaky formatting: I find it very frustrating to click a promising link only to find tiny grey letters on white.... /TMI