We have usually had great tablemates, making some friends as a pp mentioned. The past few times they have placed us at a table by ourselves, I am not sure if since we were traveling concierge they figured that we wanted a table with just the two of us and DD. DH has actually been disappointed that we sat by ourselves cause he gets a kick out of meeting new people. We feel kind of weird requesting that we sit with strangers.
Two quick stories:
First on the WBTA - we were sat by ourselves which really surprised us since we are a family of 3 total. DH actually mentioned to the servers that we could sit with other people if they wanted to merge tables. We saw several tables around us, a 4 top with an older couple at it, another 4 top with 4 people, then a large table with about 10-12 people obviously a family cruising together. We watched everyone the first two nights to see if maybe we wanted to ask for a table merge. Thank goodness we did and great that our server let us wait before combining. The older couple did not speak English and we saw the husband around the ship, he kept trying to cut in character lines. We were in line when he tried to cut and even after they were able to find a CM who could explain to him the line, he tried again somewhere else. The 4 top had some kind of strange adults, nothing particularly weird, they did have lots of food allergies though as the head server spent lots of time going over the menus and writing up tickets for them. The large table also had a foreign family which sporadically came to dinner, a lot of times late also. We felt really bad for our servers.
Second, the Dream MV was the only time where we sat with some "interesting" tablemates. The wife was very nice and intelligent and we had a lot of stuff to talk about, but the husband was pretty much silent for the most part. They had a 5 year old who mostly kept to himself and didn't say much either, usually he would just color during the whole meal. One night we were talking to the wife about her work and all of the sudden the husband who had spent most nights coloring with his son on the tablecloth just picked up the crayon cup and threw the crayons at the three of us, yelling "Why don't you just color something!". There was an awkward silence and then we colored for a bit and just went back to our conversation. A little later she kind of had a discussion with him at the table and told him that maybe their son was bored and he should go back to the room. The next night for dinner the wife came alone. The husband and son never came back nor did we see them at the last breakfast. The wife was very apologetic and told us that maybe he had too much to drink. We actually felt really bad for her but it has been our worst tablemate experience, which is luckily kind of mild. Coincidentally this was also our worst serving team. So that may have compounded the bad times as well.
We are a family of 5. I was wondering if Disney will put us at a table by ourselves or will they pair us with another family or two? I don't know how big the tables are. Also, one child will be in a wheelchair if that makes any difference as to what size table they may have us at.
).
The second night we were seated with 3 other couples that were a group who believed drinking alcohol is a sin and let us know that having a glass of wine with dinner was very inappropriate 
We requested a private table after that. 
