Stayed on the Riviera deck once. Plus - you are close to disembarkation (at ports of call not necessarily at the end of the cruise.) You are also closer to the lobby deck - a plus if you like the ground floor of the theatre. We always used the stairs except when going to the Lido - and did then a couple of times.
Minuses - on our cruise there seemed to be a lot of large groups with kids (it was spring break) so there was a lot of door slamming. Of course it was spring break so that might have been the case all over the ship. We did hear the ship drop anchor once. We also salied through a tropical depression and felt the motion of the ocean, but perhaps less so than the upper decks.
All I ask is a tall ship and a star to steer her by; John Masefield
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, 2014, Caribbean 2013, Coral 2014, Regal 2014
Star Clippers: Royal Clipper 2015