I know JJ was trying to appease the old nostalgic crowd and go back to practical effects for a large portion of the film...but for the most part it looked terrible.
That vulture thing picking at something dead when Rey was flying into town after the scavenging run was terrible. It just moved back and forth with no other movement and honestly looked like a child's feathery toy.
Maz's bar was full of terrible costumes. Because that is what it looked like. People in costumes. I can count on one hand the amount of times that one of the aliens/creatures looked good, including Chewbacca.
The Resistance aliens were bad. Ackbar looked like a terrible imitation of his VI self. Nien Nunb, the pilot who fought alongside Lando suddenly had his head enlarged and looked more fake than ever before. The alien pilot that makes the final trench run with Poe, who then dies, not only looked bad but is also magically in the crowd of people on the Resistance planet once the Falcon lands and Chewie, Rey, and Finn come off.
The three best-designed non-humans were Chewbacca, Maz, and that tentacle monster on Han's transport ship. Two of them were CGI.