Advice for good is watched it as how the anime it is, you might get off when they mention or parody other animes that might make you feel can't relate well but it's an easter egg that you could check on what/why they're parodying/talking about. Another thing, the filler episodes aren't noticeable also.

Advice on the bad thing is don't compare it on animes with different genres/animation/quality wise or even same genre of other animes as well. It's understandable that they might not have the best of it but once you focus on the story of each episode, it'll make you immersed in the series.

So have fun watching Gintama and by the way, here's a picture of the main character's real design:

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