The 737 often looks like it bounces on touch down when in fact it is just settling down on the oleos. I don't for one second believe that you saw multiple genuinely bounced landings. I have performed some abominations in my time on the 737 and (touch wood) have yet to bounce it despite some real arrivals.
I hove often sat at the hold at various airports and enjoyed watching colleagues land. I am yet to spot a trend for any particular airline.