^ That, is backwards.
If the weak player is a fish then them acting after you is a terrible thing because fish typically call too much and you will be playing them OOP and it's not profitable. When you're OOP your ability to extract value is crippled so you're far more reliant on bluffs (you have less air in your range OOP, but what air you do have is bluffing rather than floating). You should not be bluffing into these players. As for value betting, despite being against a fish you're OOP and the standard line "you have less information OOP" applies well to this and your edge is dramatically reduced, in addition to value betting thin OOP being a pretty bad spot to be in.
If you were talking about a weak player who folds way too much rather than one who calls too much, then you can steal position reasonably effectively but if they enter the pot we're giving up really easy unless we have the top of our range.
If I have loose players acting before me, I find myself less comfortable and fold playable hands.
Even a good LAG should run away in fear at the sight of a not-completely-braindead player with position on them who is willing to abuse them. Loose play only works IP, even when it's done well. If someone will continue playing loose against you from OOP then that is one of the sweetest things in this game.
Playing from OOP sucks. Position is huge. Basically no one respects and fears position enough which is one of the most exploitable things in poker.
When OOP: Play dead. When IP: you were dealt junk? Raise!