Okay, so I finished the first one last night.
-Level 57 after a full Paragon run, with their new scaling not quite letting me get to 60 in one go. I did all but one side-mission (the one you need 80% Renagade to do).
-Main missions are great. As fun as I remember them being.
-Side missions... I think people need to differentiate what they mean when they talk about side-missions. If you mean the numerous "drive around a planet in the mako clearing out bases" stuff, then yeah, it's not great. But stuff like Bringing Down The Sky, and a lot of the side-content that is more conversation-based, ranges from okay to pretty good imo. There's just not enough of it.
-The combat... They really didn't change as much as I had believed they would. Sure, if you play sniper you'll see the biggest difference, but apart from that? Eh.
-The UI is almost exactly the same. All it has now is the junk filter. Thankfully the PC version has the refined UI from the original PC version.
-All in all, it... it really isn't that different from the original mechanics wise. The combat is easier because the guns are more accurate, and the mako is a bit easier to work with... and that's it.
-Obviously I'm not including the new coat of paint and all the HDifying they did. That, and the boosts to stability and framerates is pretty nice.
Okay, now, on to #2. I've edited my save to fix the Conrad Verner and Garrus bugs, so let's see how it goes...