Rule of thumb, plus one day and 4 guys for a new panel, "if it needs replacement". So basically that can easily run 3k to 5k. (oh plus the wall repairs.)
Is it bad? tough question, it depends on your electrical needs, the existing condition of the wire and panel and how many curcuits there are. This can vary house to house.
Will you have/want to up grade portions of it? Probably yes. Has some prevoius home owner up graded portions of it? probably yes.
As always, have it inspected and understand that older homes have items that you may have/want to up grade over time.
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