I remember when I actually learned about Pendulum summoning I thought it was cheap but I started making decks with them on ygopro and found out that they aren't that bad. To make an effective pendulum deck you need a deck with mostly those monsters. It sorta works out that way because it's like basing a deck mostly for that summoning, like any other summoning method, expect for xyz summoning becomes very easy to do (if it wasn't easy enough). It's fine, I don't really mind them. Also mirror force isn't limited or banned, you can have 3.