i get my butt whooped in aikido all the time. aches, bruises, pulled muscles, mat burn, stubbed toes, sprained wrists, etc. it's not like aikdio practice is the physical equivalent of playing checkers! (my experience is with 3 aikikai dojos across 4 years. ive visited other dojos on occasion as well)
ive never found aikdio practice to be wimpy at all.
the comment is true, aikdio isnt exactly the most sensible set of ideas at first. after a decent amount of exposure it makes a lot of sense, but not at first i think.
it's a little like learning music - a person who studies afro cuban music exclusively probably wouldnt be able to make something sound like indian music. you gotta learn the different styles to have the bigger understanding.