I like fun, but this shit ain't it. The vast majority of it is just...nothing. No attention given to crafting a believable world populated with engaging characters, just Truck-kun and then either random comedy lolz or "no we didn't rip these mechanics straight from a generic JRPG why would you say that." I've yet to read a premise for any of these series that's instilled a desire for me to give them a try.
You know what were fantastic, though? The older girl-in-another-world series that came out long before the term "isekai" was a gleam in anyone's eye. Escaflowne, Magic Knight Rayearth, Twelve Kingdoms. Shows that actually gave a damn about world-building.