You’re obviously not the only person who finds them boring, the comment section of every Pokémon post since the release of Regice has been filled with people complaining.
If you’d rather do other raids then do em. Regirock is the best of the three, and I think it’s usually worth it to do tier 5 raids for the rewards. Every month can’t have the best Pokémon in the game as raid bosses, we will probably get Groudon and Rayquaza again probably before gen 4.
Gen 4 then brings 3 great legendaries, 3 not so great legendaries and one that’s up in the air.