I'm not expert but i'll assume that 4 AS is ~ equal to the same in highers, so an ABBC=BBBB, which is about the average going rate (in highers) for most courses in scotland so I'd say average. But you do have 5 As at GCSE, so it all depends on your A2 I guess.
In terms of grades last year I was ok (not perfect, but ah well...) at standard grade/higher (scottish qualifications)
6 1s and 2 2s at standard grade (usually we take 8 subjects, 1 is best grade you can get, 7 is worst)
5 As at higher (Again, usually take 5)
We'll see I do this year though!