A thousand times yes. 1.4% is not astronomical but still way to high compared to what you'd get through Vanguard. The only reason to tolerate the often times absurd fees of an employer plan is the match. Without the match you can do much better with a Roth IRA through someone like Vanguard, and fee measured in tenths of a percent.
The only other consideration is the higher contribution limit on a Roth 401k vs a Roth IRA. Following the Mustachian Mandates, you'll hit the $5,500 limit on a Roth IRA pretty quickly. At that point you have to figure out if the tax advantage is worth the extra fees. IMO it is not, but I also value the liquidity of having taxable investments pretty heavily.