Well I've got 3 walmart ficus: a retusa and 2 ginseng.
The upside: they are nearly indestructible.
The downside: the majority of them are ugly
So.
My retusa wasn't ugly but I really dislike the huge S shape of the trunk these trees generally have. The good thing is that as they are more than though I was able to shop a big part of the trunk and the tree grew some new roots and is now free of this S shape.
My ginsengs: I hate the big bulbs that are the characteristic of these trees so I just took a carving tool and remove/carved them. I also chopped basically all the branches. Now my 2 trees are growing leaves so they survived. I didn't check but I'm pretty sure they are also growing a bunch of new roots. Next spring I'll pot them higher in the ground so the start of the new roots will become the start of a nebari and normally the bulbs will be gone.
In conclusion I will say: I'm sure you can find much better starting material in term of ficus but with these walmart stuffs you can also have a lot of fun torturing them to try to get something nice from and ugly start