It'll also mean that you'll have put a bit more thought into your kit/player selection and what squad you're part of.
I started as a recon, and got that up a bunch of points until I had a decent selection of weapons and scopes to choose from depending on the map, and what I wanted to achieve. That took a couple days of playing.
I then took the assault, and only played as that until I built up those points, to where I've unlocked all but the last weapon.
Then it was as a medic (which I'm still using), and have just unlocked the 4x sight (which likely won't get used much).
My point though, is other than the sniper with the basic scope, the starting kits weapons and sights really blow. I had a heck of a time using and sticking with the medic until I got the red dot sight. Now I enjoy it. I expect the engineer will be the same. Very painful to start with.