There's different kinds of "too big". If you're holding it and wondering why you bought a knife that "looks frikkin huge" that's okay, it'll start to look smaller as you get used to it. I've had 10 inch bladed knives that felt huge and unweildy when I first handled them, but after a while they really didn't seem all that big, kind of dainty in the hand even (cold steel trailmaster in this case). Bigger knives do take a little getting used to depending on their balance. My Becker magnum camp is very easy to handle, the balance and blade shape lends itself to a natural cutting motion, so there was no need to acclimate myself to the way the blade handled so I could do something as simple as cutting rope. The Trailmaster I never really got used to, probably the thin handle. Despite getting used to it, (it felt really light in the hand)I always felt like I was swinging a brick with a handle at something, instead of a knife.
If you say "I dunno if I'd want to carry this around in public everyday" then yeah, in that sense it's probably a bit big, if you work outdoors alot or spend time hiking then it's just a matter of how much knife you're willing to carry around. If you aren't comfortable with the public opinion of a knife that size it's probably best to stick with smaller blades.
How's this, if you feel a bit uncomfortable pulling it out in front of other people to cut something then just use a smaller knife, and keep the big one in the sheath until you find something you wouldn't wanna do with the folder. Don't feel embarrased if it's a job that the larger knife is suited for, just cut the thing and put it back like you've been doing it every day of your life, and you've a good chance no one will care one way or the other.