I have to say immediately that I never had any contact with comics from DC's LoT. This opinion is based only on what I saw in pilot episode.
Whole pilot was funny, and when I say funny, I mean BAD funny.
Acting is ridiculous. Very plastic, there is no flow, everybody is very stiff, if you know what I mean.
Dominic Purcell, I liked him in Prison Break, here not so much, he is to fake, he's trying to hard.
Rip Hunter, English (of course), trying to be funny from time to time, but still doesn't deliver.
Caity Lotz, confused.
Franz Drameh, he looks like he wondered on to a set and started playing the role.
Brandon Routh, very bad version of Ant Man.
Ciara Renee and Falk Hentschel, bland.
Wentworth Miller, bad, but better than the rest of them.
Casper Crump, so Vandal Savage lived for 4000 yrs and couldn't learn English language. I know someone will say, but he was not born in English speaking world, but still, 4000 yrs...
Like I said, I never read the comics and that's very good, because if I did, I know I would be very very angry right now.
I don't know about the future of the show, I will try and watch at least 3 episodes, if they don't deliver by then, they never will.
My personal opinion is that DC is way way behind MCU, and they are trying to catch up, but everything is so fast and so badly put together. At least if you know that you are late, do it right.