Typical lineup...
RF Betts
LF Benintendi
1b Hanley
DH Martinez
SS Bogaerts
3b Devers
2b Nunez
C Vazquez
CF Bradley
Let's just throw Moreland in there as an extra "top half of the lineup" hitter and Leon as an extra "bottom half" guy - even though it isn't exactly "half". So the top half is: Betts, Benintendi, Hanley, Martinez, Bogaerts, and Moreland. The bottom half is Devers, Nunez, Vazquez, Leon, and Bradley.
Top Half
Betts: .365/.438/.760/1.198, 211 ops+, 31 RAA*
Benintendi: .285/.367/.477/.844, 124 ops+, 3 RAA
Ramirez: .271/.328/.422/.750, 99 ops+, -2 RAA
Martinez: .343/.397/.680/1.077, 180 ops+, 15 RAA
Moreland: .313/.395/.596/.991, 160 ops+, 6 RAA
Bogaerts: .301/.336/.545/.881, 130 ops+, 2 RAA
Bottom Half
Devers: .237/.286/.418/.705, 85 ops+, -8 RAA
Nunez: .241/.262/.364/.626, 65 ops+, -8 RAA
Vazquez: .193/.238/.235/.473, 28 ops+, -14 RAA
Leon: .208/.263/.283/.546, 47 ops+, -1 RAA
Bradley: .165/.267/.252/.519, 41 ops+, -7 RAA
*RAA = "runs above average"
So basically, the top half of the lineup is killing it, and the bottom half is just abysmal. It's gotta be tough for a pitcher to get through the top 5-6 guys in the lineup, but it's basically cruise control with the bottom of the lineup. I guess it's working out, as they're 2nd in the league in runs scored.