Anyone who pre-judges this show based on still images alone is doing themselves a huge disservice; Thundercats Roar is HILARIOUS, and packed with so much wholesome energy and all-around cuteness, it's hard to imagine anyone finishing an episode without a huge smile on their face.
And if you HAVE watched the first couple episodes, and still hate it? You're probably too cynical to be watching kids / family shows in the first place; Go watch some gritty crime drama or something, instead.