I don't mind watching top tiers that much, it really matters how well they play and how much I care about each player.
Like watching the Big Five duke it out is always amazing because they always do extremely impressive stuff against each other, and you always know that all of them have fierce rivalries with the other so there are a lot of emotions in each match.
Same with watching players right under that threshold. PewPewU vs Hax was an extremely high-leveled game, and it's very interesting to see how players adapted and triumphed as the set went on.
PPMD vs Remen was entertaining because Remen taking a game off PPMD was a big deal to Remen's reputation as a player.
Hax vs Leffen was entertaining because they were rivals, and they are arguably at the same skill level.
Aisengobay vs Fiction, even though it was Fox dittos, was incredibly fun to watch because it was an upset from one side, and he had an unorthodox style of playing Fox.
M2K vs Shiz, Fiction vs Animal, KDJ vs M2K, Lovage vs Javi, Javi vs PPMD, PewPewU vs Silent Wolf, Kels vs M2K, Hax vs Shroomed, KirbyKaze vs Weon-X...
I could go on about amazing sets between top tiers that are incredibly fun to watch. Anybody who skips matches simply because they see what characters are on the screen can seriously be missing out a lot.