SGU was a soap opera in space. So much drama between the characters instead of an outside force much of the time. SG1 was mostly focused on the SG team working together against something external like the goa'uld. Very rarely was there anything other than comradary or in jack and sam's case, romantic feelings and/or sexual tension. The chemistry between the main cast was great. SGA had some degree of intracast member tension but by and large they still worked together well. SGU had a lot of mistrust between Rush and everyone else and for good reason. He was an arrogant dick that put his own interests above others a lot of the time. Keeping secrets from them and generally being unlikable. Eli's arc was just sad. He was away from his mother who later became ill, watched the woman he had a crush on choose someone else and had to personally sever the connection between him and his new romantic interest to save Rush then if that wasnt bad enough, we dont know what happens to him after the finale. SGU might have been ok and I stress ok but not on par with SG1 or SGA if it was a completely separate franchise but alas, it was part of the same franchise and there was no justifying that it held its own against the others.