If they didn't give themselves enough time to properly tell the conclusion of their story, then I'd say that's another sign of poor writing leading up to the finale. I don't remember Seed's ending (it's been more than a decade since I watched it); I do remember I didn't like the show much, and as a result I never watched Destiny. So I can't really compare it to those, but generally speaking, saying something is better than its worst peers isn't high praise.
I'm not saying you should dislike the ending; discussion for me doesn't hinge on convincing you to agree with what I'm saying. But it is a discussion, and I'm going to share my opinions. If you make a statement, I may make a counterpoint. That's what discussion is; I'm not sure why that bothers you so much.
Overall, I liked the ride that was IBO as well. I just don't feel like the last several episodes live up to the quality that came before it, and Rustal winning has nothing to do with my dislike of it.
EDIT: I wrote this response before you edited in this tirade:
Its not like you'r offering any PLAUSIBLE alternatives aside from complaining Sdwoodchuck, I've tried to avoid responding to you, but you keep repeating the same thing over and over again that the writing was trash in the end or was poorly done for the past 6 eps now. Get over it or talk about something a bit more constructive without throwing a bunch of big words around and complaining the show did not go the way you wanted. You responded to me and this is my response. Its really getting annoying now.
As latenlazy says below, it's not the critic's responsibility to offer alternatives to the things they see as problems. If you want plausible alternatives though, I'd have been glad to give them; you haven't asked. You just do this thing where you get snippy because I disagree with you. If you dislike the fact that I dislike the series, how about you--as you so well put it--"get over it." I'm not less entitled to share my opinions about the series just because they're negative, and I'll also point out that I've never told anyone to stop praising the things they like; I find the behavior lashing out at criticism to be frankly asinine. If this is the kind of discussion you're good for, then please, by all means, go back to not responding.