10. Any of those all-plastic mechanical pencils. No metal ferrule, and "el cheapo" bottom-of-the-barrel construction. Bic, Pentech, Pilot, Zebra, or whatever. To me those don't wear well, and the lead will have slop or eventually have slop, and they're just not worth my time. I don't like 'em, so if I get one I don't tend to hold onto it. Tends to be a throw-away pencil in my opnion.
9. Fancy pants mechanical pencils. Gold plated or whatever, typically sold by makers of fancy pens. No real need for this as they're overpriced and provide no special extra functionality. Would only get one if it were somehow magical and my signature written on something with it would guarantee a hot shapely background singer for Beyonce would go down on me or something. Which is highly unlikely given I'm on the old side, a bit portly, limited income to the point of being broke, and about as white as any stereotypical white guy you could think of. That kind of magic doesn't exist in this universe as far as I know.
8. Drafting pencils. Not quite gold plated, but somewhat less expensive fancy pants pencil by another name. Typically German brands. Not that they're bad, quality is good. Just no special properties given the price.
Any of those above I don't really own as I'm not some super collector with money to fritter away like that. So I don't seek out anything just because. Only if a mechanical pencil is affordable and has reasonably good qualities will I give it a try. So all the ones on the list from here are ones that I currently own in my little collection.
7. Pentel Forte. Nothing too special, essentially it's a variant of the Sharplet. In my case I don't have the extending eraser version. However the rubber grip is awkward, slippery, and doesn't hold position well (it slides around even), so it's bumped to the bottom of the list.
6. Pentel Quicker Clicker (second generation), which is a sideclick pencil. You'd think the features would be nice, but it's ruined by a horrible rubber grip that's awkward for most of the same reasons as that on the Forte. It seems like this is the cheapest version of that model too. As it's a second generation, you're wondering how they screwed it up bad enough to have this spot on my list.
5. Pentel Sharplet 2. Bare bones, basic, lightweight. Likely my introduction to mechanical pencils in grade school. Probably one of the cheapest pencils with a metal ferrule, but that bit of construction makes all the difference.
4. Pentel Quicker Clicker (third generation), a second mention of this pencil. Somehow they listened to some of the complaints, so this is a better pencil than the second generation. Grip is textured, fit better or even bonded to the plastic, slightly trimmed and downsized. Basically it's not as slippery, and it's trimmed down. So this one gets a higher spot than the G2 version.
3. Zebra M301. Basically it's Zebra splitting the difference between the Pentel Sharplet 2 and the Pentel P201. Not bad, given Pentel offers the best quality for the money in mechanical pencils.
2. Pentel P201. Nothing too special, but a classic. Just one of those sturdy pencils with a quality build and a solid advance.
1. Pentel Quicker Clicker (original), these are no longer made and I heard packaged ones fetch mint on eBay. For good reason too. It's got a sturdy build quality (lasts forever with normal use), a side click advance, a reasonable sized eraser (instead of a minimal one that only functions as a stopper to keep leads from falling out), and simply is a no bullshit near to perfect design. Which makes you wonder why anyone ever wanted to ruin it in successive generations.