Most people, myself included (though I don't consider myself an audiophile), aren't going to really notice this. My Polk TsX center channel sounds great from pretty much any spot remotely in front of it, AND it's upside done (angling up). It's an MTM.
You don't know til you know.
That's how I describe it. I was VERY happy with my Polk's until I read up on other speakers. Then, I got B&W's entry level speakers, and they sound MUCH better (more clear).
I was happy with my Klipsch RW-12D. Then, I took the leap, built my own subwoofer. It's just a monster, it truly is so much bass and it's clear, scary clear.
I don't want to write you a novel, but in my experience, I had 0 clue what I was missing until I actually took the leap. I highly suggest DIY, myself, as an audio noob with 0 hands on experience (I don't like to get dirty at all), it was a learning experience and what I got was an AMAZING finished product. If I had the cash right now, I would throw out all my speakers and go full DIY. Polks are great entry level, but you won't beat the value of DIY without spending a LOT of cash, or going to somewhere like JTRspeakers (which still costs a lot). $1000 in DIY speakers would probably be the equivalent of around $3000+ in commercial depending on where you purchase.