Were dinosaurs in the early-middle triassic just a bunch of nondescript eoraptor-esque critters or were some already starting to get bigger and weirder despite the current domination of pseudosuchians and therapsids?
As far as we know, yeah they would've all been small scurrying guys. Thing is though, we have no definitive evidence of any true dinosaurs in the middle or early Triassic, except for the very un-definitive Nyasasaurus.
What we do have though are dinosauromorphs, the group of small dinosaur-y things that aren't quite yet dinosaurs! Even so, most of these also come from the late Triassic (like the fantastically leggy Marasuchus), and ones from the middle Triassic like Asilisaurus kongwe from Tanzania were absolutely part of the Tiny Little Guy genre. Like this is just a weird dog:
Image ID: Digital illustration of the small four-legged dinosauromorph Asilisaurus, in a half-crouched posture facing to the right. Its head is upright and alert, its mouth slightly open. Its body is covered in protofeathers, and mottled light brown fading to light and dark stripes on the tail. The snout is dark grey and the face has a red wattle of skin below the yellow eye. End ID.
We don't see any larger than this until the late Triassic, when dinosaur fossils seem to suddenly burst into the fossil record about 233 million years ago with Staurikosaurus and then they're everywhere!
Image ID: Size diagram of Asilisaurus and the earliest definitive dinosaur Staurikosaurus next to a light grey human silhouette. The Asilisaurus' head comes to the mid thigh of the human, and the Staurikosaurus' head comes to the human's hip. End ID.
