A few random thoughts:
* So far, nothing that has been shown has obviated anything from the other TV series. Canon has been tweaked around here and there - and in a good way, I believe - but there is still 100 years of history to go before the time of Kirk and Spock. A lot can happen in 100 years: there is still plenty of time for the Vulcans to stop being weiners, plenty of time to form the Federation, plenty of time for the Klingons to get mad at the still-not-formed Federation and start a war, plenty of time for the Romulans to start a war also, etc. etc. Plus, it's not like the original Star Trek was all that concerned with its own canon way back when, so there were plenty of inconsistencies even back then.
* The Enterprise cast and the setting do deserve better than what they've gotten. There have been a few too many blah episodes lately. A change in the behind-the-scenes folk, especially producers and writers, seems reasonable to me, rather than chucking the series altogether.
* I actually find the Vulcans interesting, as they're shown on Enterprise - I really want to see how the influence of the humans begins to change their society, so they go from being the rigid, unimaginative, hypocritical society they are in Enterprise, to the slightly-less-rigid, slightly-less-unimaginative, rather less hypocritical society we see in the original show and beyond. Plus, I'd like to see how they go from being the dominant player to being basically second banana to the humans.