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Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars- Both Canons] What did the other Chiss think of Thrawn?
gpt
Canon: 

Thrawn is a radical who constantly pushes against Chiss society rules. While many have trouble discrediting his results his methods are put under heavy scrutiny and Thrawn lacks many if any political allies outside of the military high command.  This results in many consequences for Thrawn for example: his ship is put at the bottom of the repair schedule by political adversaries within his own family to prevent him from taking an active role in Chiss society. 

TLDR: Thrawn gets results but his methods piss everyone off, friends and enemies. Enemies because Thrawn breaks or bends Chiss rules and friends because Thrawn is so politically inept that they’re the only people covering his dark blue ass.

Sources: Thrawn Ascendancy: Chaos Rising and Thrawn Ascendancy: Greater Good.

Speculation: Its very likely the reason Thrawn is sent as a spy to the Empire is because Thrawn causes so much politics turmoil in the third book that his military is over other wise and this is suggested by his allies or himself as an efficient and effective use of him that doesn’t result in critical political fallout.