I am looking forward to another weekend with the game as well as an additional map. I was in the "I hate these changes" camp for the first few hours I played because like most of you, I LOVED the original and this just felt a little bit different. I stuck with the tech test and I would say it had a pretty large curve to get used to the changes but I actually started to love the game more and more as I kept playing. I grinded my way to unlock cloak (was my main perk in the first) and I started to really learn the new mechanics and started to appreciate some of the changes. I found myself playing smarter and eventually back to the point where I was getting some 20-30 kills per round and leading the team in bounties. I learned how to use my titan better, how to move around the maps quick, how to utilize batteries, and generally how to use the games mechanics to outsmart and outplay my enemies. That was definitely NOT the case over the first few hours as I struggled at times to even stay at .500 with my kills and deaths which had me wanting to throw my controller at times.
To those irritated with the changes, I would say just give it more time (I say my individual curve took me about 10-12 hours). I am now back on the super hype train and I was loving the game by the end of the first weekend and having so much fun. Also keep in mind I am anticipating more weapons, more attachments, more perks, more titans, and more maps. This is just a small sample and when the full game opens up, you won't be stuck with the few options they give you in tech test and you will be able to find the combination that fits your playstyle (ala myself with using cloak).
Also, one last note. It has been mentioned a few times but changing the aim settings from "Default" to "Classic" helped immensely to give me that Titanfall 1 feel and control over my pilot.
Hope this helps someone who is reading all the negativity that there are some out there who had a good experience when getting over the learning curve.