I don't think this is really the place for a MARDEK character tier list discussion, but this does feel nostalgic for the days of perpetual MARDEK tier list discussions.
Slenck provides zero utility or support to the party with his shallow skillset and Solaar, Vehrn and Legion can do his high single target gimmick just as well, if not better, while also being able to do more than just damage.
It's not to say he's useless, he's still better than Donovan and Zach since they have the exact same problems, but he's simply outclassed. Anything he can do, someone else can do too.
Slenck provides zero utility or support to the party with his shallow skillset and Solaar, Vehrn and Legion can do his high single target gimmick just as well, if not better, while also being able to do more than just damage.
It's not to say he's useless, he's still better than Donovan and Zach since they have the exact same problems, but he's simply outclassed. Anything he can do, someone else can do too.