To everyone who is discouraged by the bad reviews - don't let them drive you away of this show. I love the original Trigun and I love the Trigun story. This show is obviously a kind of prequel. The character of Milly isn't replaced and all the characters are a bit different because we see them in different time then it was in the 98 series.
I really kept my expectations low, because I was afraid of the CGI and new art style, but the show didn't disappoint me. On the contrary I am eager to see another season and I very much hope that there will be more than one. Trigun as a story masterpiece deserves this new look and its story told in more depth.
Also regarding the manga, there is so much more to cover than the original series could do. I can only be exited for more seasons! (I had to submit my first review for this :D )