I only bought Dancing Queen. Abba is too pure for me. For music to really move me it has to come with some human experience (Blues, Folk) or be clever and ad lib (Jazz) or be deep and stirring (Mahler, Mozart etc) or have a raw, urban edge (Rolling Stones, Clash, The Animals) or just be clever pop (Beatles, Beach Boys).
I find Abba a bit over-produced. They have a perfect studio sound that i find a bit sterile.