I rewatched a couple of installments of Enterprise, and yes the Vulcan's were "off" in their portrayal. The thematic elements were wrong and actually the root cause behind a 3 part episode in Season 4 to put the Vulcans back towards the Vulcans were knew before.
However, I also noted something else. The Vulcans talked wrong. Vulcans up to Enterprise had a slightly slower, deliberately paced diction and did not use contractions when they spoke. The Vulcans in Enterprise sounded no different than ordinary people on the street from Earth. This continued even after the events of Kir Shara in Enterprise. It reminds me of one of the annoying things in the TNG movies - Marina Sirtis magically lost her accent and diction from the series and Troi in the films sounds just like any woman on the street. To me, both denote LAZINESS on the part of the directors and actors.
Thankfully, in the 09 movie both Spock and Sarek are portrayed correctly. They have the classic Vulcan diction.
Okay, I'll play along
purely for rhetorical reasons alone; we got to talk about something
Vulcan speach; in ENTERPRISE it is pre-universal translator. we are shown one exists but it has not been perfected yet
-the vulcans were limited in their willingness to extend technology to Earth. In enterpise, Tapaul explains she had to learn human language, english, in order to be assigned to the vulcan mission on earth.
it is likely that the vulcans initially learned their english from the point of first contact. these humans were a motley band of survivors who spoke the american dialect, probably with a mid-west drawl and used american slang
once the UT became effective, it is likely that Vulcans chose to speak in their own language since it could be precisely translated. the ut would use standard english eliminating slang and contractions (the programmer was probably canadian
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again, i noted your points and agree, it is rather sloppy of ENT TPTB to not have been more precise, but I doubt if they ever considered the issue in any manner approaching how you did
Your case Mr Prosecutor