My experience with this type of dove tail joinery is fine if the table is not going to receive hard use, i.e. children leaning, pushing, etc. The constant pressure of hard use added to the natural tendency of wood movement, expansion, and shrinking due to heat, humidity, cold, hot, and how the wood was cut and dried may, in a few years, loosen the joint (even with the best of glue) and create a wobble affect. I would agree with the full or half skirt with tendon/mortise joinery, followed with two pegs through each tendon, and finshed with a cross brace on the inside that attaches to each skirt with an attachment, i.e. bolt or dowel, in the middle of the table leg on the inside. over the long run, this method seems to give the most lasting stability to the table legs.