1) All but the top self-serve plan ($200 at the time) wasn't worth anything for a business past the "finding a market" stage. No SLA at all under that level (at least, at the time)
2) The $200 plan, though, is actually a hell of a bargain. You get a lot for it. If your load is almost all HTML/CSS/JS and some light-ish worker use. And (allegedly, see #5) your bandwidth use isn't crazy high.
3) They basically don't care about serving any need between the top self-serve plan and a ~$5,000-to-start Enterprise plan. If you don't fit in the top self-serve but are under that level...
4) Surprisingly, given their reputation at the lower levels of service, in the Enterprise tier, they weren't competitive on bandwidth. If the main thing you need to do is sling bits, you can do that quite a bit cheaper elsewhere. Overall, they seem to want customers who need lots of their services, not just any one component. If you don't need their various corporate VPN type products and a bunch of other stuff, they're a bad fit.
5) We were told by a competitor that OP's experience is common and is often perceived by customers (their perception, mind you) as a bait and switch (see also: that huge gap between self-service and enterprise, in which they offer no options). Now, the competitor has some self-interest there, but even the non-sales guys on the call instantly kinda smirked and shook their heads when I mentioned CloudFlare.
6) We were told incorrect things by CloudFlare's sales folks. If we'd followed their advice, we might be OP.