Our 1-4 hitters gave us absolutely nothing yesterday and we scored 5 runs to win the game. A deep lineup gives optimism, even if (to beat a dead horse to a pulp) we don't have the vintage Papi + Manny combo. Baldelli/Drew, Bay, Lowell is good enough to be some other team's 2-3-4 in the lineup. Not a world-beating 2-3-4, I grant you, but not terrible.
As Kilo said, Penny is a cautious reason for optimism. We're not counting on him to give us anything, but if he can give something like 6 IP, 3 R every time, that's big.