jakwrite is a complete maniac playing over 90% of his hands and betting/raising with any draw.

Dealt to Hero
Gingerman221 calls [$2].
Hactar77 folds.
RdgROBO raises [$4].
RustyBrand33 folds.
Hero calls [$4].
AKlRA folds.
ELLIE888 folds.
jakwrite calls [$4].
jackiepackie calls [$3].
pvruybalid folds.
Gingerman221 calls [$2].

** Dealing Flop **
jackiepackie checks.
Gingerman221 checks.
RdgROBO bets [$2].
Hero calls [$2].
jakwrite calls [$2].
jackiepackie calls [$2].
Gingerman221 calls [$2].

** Dealing Turn **
jackiepackie checks.
Gingerman221 checks.
RdgROBO bets [$4].
Hero calls [$4].
jakwrite raises [$8].
jackiepackie calls [$8].
Gingerman221 calls [$8].
RdgROBO calls [$4].
Hero calls [$4].

** Dealing River **
jackiepackie checks.
Gingerman221 checks.
RdgROBO checks.
Hero checks.
jakwrite bets [$4].
jackiepackie folds.
Gingerman221 calls [$4].
RdgROBO calls [$4].
Hero raises [$8].
jakwrite raises [$8].
Gingerman221 folds.
RdgROBO folds.
Hero calls [$4]

Did I mess up anywhere? Is the river CR marginal or plain bad?

Raise the flop. Betting the river is probably slightly better, especially if there's a chance he'll raise you, but given your read it seems OK. Raise the flop, though, for sho', that's a weak call.