1) AVOID! Look good but the only good bit is right at the end before you hit loch Treig.
2) In the direction you’re doing it, its a dullish quad track climb from the bothy (steep but easy surface) and a very rocky, technical descent down to Meananach. The guide books all recommend riding up the rocky singletrack, perhaps to avoid scores of people riding down it and trashing it. Either way, you’re riding it the GOOD way.
3) On a dry day with good legs this would be all right, there are some nice sections, but you’ll still be on and off the bike.
4)Starts a bit boggy and hacked up by motorbikes, the higher you get, the better it gets, rocky singletrack to the bothy. After the bothy its more of the same (starting to descend) until the lochside, at which point it sort of fades into 1km of bog until the reservoir (or at least, I couldn’t find that bit of the track).
Overall I reckon that sounds a great route, if you wanted to guarantee better condition trails (or its hammering with rain) you could detour from Meananachan to Kinlochleven on a good landrover track (with option mad descent) but would then need to climb the WHW back up to the Devil’s Staircase (assuming thats where you’re headed next).
Edit: Ah, that route above would be your ‘cop out’ 😀