Yeah it feels bad if you're forced to dodge, which is why it's generally only worth it if it's clearly a lost game (e.g. someone openly trolling), in which case it's definitely worthwhile compared to losing mmr+more LP+ probably 20 minutes. Lots of people are perhaps too optimistic ("They're just joking they wouldn't actually troll a ranked game...would they?"), or refuse to dodge themselves since they don't want the penalty (despite it being smaller than the penalty for the inevitable actual loss).
If the penalties were less severe, there'd be issues with somewhat longer times to get into game (with 10 people per cchamp select, odds of at least one dodging is reasonably high), and there'd also potentially be abuse cases (people looking up their whole team, and dodging unless theres a clear smurf on their team), so we're kinda stuck with it.