The argument was literally that the State of Texas has an interest in the elections of other states and was rejected on a lack of standing which is an emphatic "No" to the argument.
Since 7 justices said they didn't have standing, and the other 2 said it was impossible to grant relief, it's pretty clear that the case as a whole was not any good. Using a misleading legal phrase to imply that the case had non-legalese "merit" that the courts chose to ignore is.. misleading.
In order to say whether the case is good or not you would have to point to something specific that makes it legally weak. E.g. controlling precedent. Standing has no bearing on the merits of the case, so everyone using standing as an argument is not making a real argument but is just playing a shell game.