ambi safety is good for a lefty like yourself yes.
Front cocking serrations are a "demerit" rather than feature to most people - and few actually use that area for cocking anyway. I, like you, don;t care much.
Beaver tails are pretty much standard on anything but bare bones GI guns these days. Yes you can easily get a non-beavertail safety. I have no problem with hammer bite even with a spur hammer with these, but some do. Subjective thing, but almost everyone but the orignalists semm to think beavertails are a feature.
Skeletonized hammer? Little bit lighter and supposedly infinetismally faster reset. Mere mortals can't tell the difference for the most part, but many people prefer the look (including me in this case - I don't care for solid triggers)
Generally speaking Taurus are a value priced brand for any model. Part of it is cheaper Brazilian labor. They did go out of their way though to make this 1911 comparable to the higher end makes in quality of parts and construction, and I think they did a good job while retaining their low cost. I could quibble a bit on some of the design cues, but the ones I've handled are nicely made. I'll probably pick one up one of these days next time I get a hankering for another full size.