Yes, it does limit your options a bit, but if you dare you can use the Blitzers to score. Also AG 3, and with a rr in hand they are just as capable at catching. The throwers already have Sure Hands and Pass, so you wont need the rr there.
It is a matter of choice. Sure, the Catchers are great scoring machines. I prefer to get them later on (sometimes, I use Hummies in more than one League). In that way the Linos have gotten some valuable skills (Kick, Wrestle), and the Blitzers too, so your Catchers wont be too vulnerable, as they are protected better by their team mates.
In general, I think you might win less in the beginning, but after you earned some skills, you will win more. Also, you will lose less players (all St 3, all AV

.
I play Hummies with and without Catchers, both is fun IMO.
With Catchers, btw, I use them first of all to try and feed the Thrower(s) some completions. Might be risky, but they get som much better with Accurate or Block (I usually develop an offensive and a defensive thrower). The Catchers want Block or Wrestle as a first skill, except of course Doubles or stat increases (take them!). Then you can give one Strip Ball (great on a Mv 8 Dodging Wrestler) or Sidestep, but there are a whole lot of options, really.
Good luck!
M
'Millions of pieces, pieces for free.
Millions of pieces, pieces for me!'