Still doesn't work, I have this so far:

=SWITCH

(

LAST(Fields!Value.Value, "DataSet1") = 0, 0,

(FIRST(Fields!Value.Value, "DataSet1") >= LAST(Fields!Expr2.Value, "DataSet1")),3,

(FIRST(Fields!Value.Value, "DataSet1") / LAST(Fields!Expr2.Value, "DataSet1")), >= 0.7, 2,

(FIRST(Fields!Value.Value, "DataSet1") / LAST(Fields!Expr2.Value, "DataSet1")) < 0.7, 1

)

The error: 'syntax error' - underlined above

What do you detect here?